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Pages For Mac El Capitan

About Apple security updatesPages For Mac El Capitan
Pages Per Mac El Capitan
Feb 12, 2018  If you were using Pages v5.6.n (yellow icon) on El Capitan, and do not have it on a Time Machine backup, then you are out of luck, as it is no longer obtainable. If you were using Pages '09 v4 (purple icon) from the (retail) iWork '09 DVD, (or the Mac App Store) — it too is no longer available from Apple as it was discontinued in 2013.
May 15, 2020  A bootable installer for macOS El Capitan is a good idea even if your plan is to perform an upgrade install. Having your own copy of El Capitan on a separate device ensures that you'll always be able to install or reinstall it.It also helps in performing basic troubleshooting tasks, even if you have no connection to the internet or access to the Mac App Store.
For creativity. From the start, Pages places you in the perfect creative environment. It puts all the right tools in all the right places, so it's easy to choose a look, customize fonts, personalize text styles, and add beautiful graphics.
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
For more information about security, see the Apple Product Security page. You can encrypt communications with Apple using the Apple Product Security PGP Key.
Apple security documents reference vulnerabilities by CVE-ID when possible.
OS X El Capitan v10.11.6 and Security Update 2016-004Released July 18, 2016
apache_mod_php
Available for: OS X Yosemite v10.10.5 and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple issues existed in PHP versions prior to 5.5.36. These were addressed by updating PHP to version 5.5.36.
CVE-2016-5093
CVE-2016-5094
CVE-2016-5096
CVE-2013-7456
Audio
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to cause a system denial of service
Description: A null pointer dereference was addressed through improved input validation.
CVE-2016-4649 : Juwei Lin(@fuzzerDOTcn) of Trend Micro
Audio
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A memory corruption issue was addressed through improved memory handling.
CVE-2016-4647 : Juwei Lin(@fuzzerDOTcn) of Trend Micro
Audio
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to determine kernel memory layout
Description: An out-of-bounds read was addressed through improved input validation.
CVE-2016-4648 : Juwei Lin(@fuzzerDOTcn) of Trend Micro; Jack Tang and Moony Li of Trend Micro working with Trend Micro's Zero Day Initiative

Audio
Available for: OS X El Capitan v10.11 and later
Impact: Parsing a maliciously crafted audio file may lead to the disclosure of user information
Description: An out-of-bounds read was addressed through improved bounds checking.
CVE-2016-4646 : Steven Seeley of Source Incite working with Trend Micro's Zero Day Initiative
bsdiff
Available for: OS X El Capitan v10.11 and later
Impact: A local attacker may be able to cause unexpected application termination or arbitrary code execution
Description: An integer overflow existed in bspatch. This issue was addressed through improved bounds checking.
CVE-2014-9862 : an anonymous researcher
CFNetwork
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to view sensitive user information
Description: A permissions issue existed in the handling of web browser cookies. This issue was addressed through improved restrictions.
CVE-2016-4645 : Abhinav Bansal of Zscaler Inc.
CFNetwork Credentials
Available for: OS X El Capitan v10.11 and later
Impact: An attacker in a privileged network position may be able to leak sensitive user information
Description: A downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.
CVE-2016-4644 : Jerry Decime coordinated via CERT
CFNetwork Proxies
Available for: OS X El Capitan v10.11 and later
Impact: An attacker in a privileged network position may be able to leak sensitive user information
Description: A validation issue existed in the parsing of 407 responses. This issue was addressed through improved response validation.
CVE-2016-4643 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua University; Jerry Decime coordinated via CERT
CFNetwork Proxies
Available for: OS X El Capitan v10.11 and later
Impact: An application may unknowingly send a password unencrypted over the network
Description: Proxy authentication incorrectly reported HTTP proxies received credentials securely. This issue was addressed through improved warnings.
CVE-2016-4642 : Jerry Decime coordinated via CERT
CoreGraphics
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to elevate privileges
Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed through improved input validation.
CVE-2016-4652 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative
CoreGraphics
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: A memory corruption issue was addressed through improved memory handling.
CVE-2016-4637 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
FaceTime
Available for: OS X El Capitan v10.11 and later
Impact: An attacker in a privileged network position may be able to cause a relayed call to continue transmitting audio while appearing as if the call terminated
Description: User interface inconsistencies existed in the handling of relayed calls. These issues were addressed through improved FaceTime display logic.
CVE-2016-4635 : Martin Vigo
Graphics Drivers
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A memory corruption issue was addressed through improved input validation.
CVE-2016-4634 : Stefan Esser of SektionEins
ImageIO
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4629 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
CVE-2016-4630 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
ImageIO
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to cause a denial of service
Description: A memory consumption issue was addressed through improved memory handling.
CVE-2016-4632 : Evgeny Sidorov of Yandex
ImageIO
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4631 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
ImageIO
Available for: OS X El Capitan v10.11 and later
Impact: Processing a maliciously crafted image may lead to arbitrary code execution
Description: A memory corruption issue was addressed through improved memory handling.
CVE-2016-7705 : Craig Young of Tripwire VERT
Entry added November 30, 2017
Intel Graphics Driver
Available for: OS X El Capitan v10.11 and later
Impact: A malicious application may be able to execute arbitrary code with kernel privileges
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4633 : Marco Grassi (@marcograss) of KeenLab (@keen_lab), Tencent
IOHIDFamily
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A null pointer dereference was addressed through improved input validation.
CVE-2016-4626 : Stefan Esser of SektionEins
IOSurface
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A use-after-free was addressed through improved memory management.
CVE-2016-4625 : Ian Beer of Google Project Zero
Kernel
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-1863 : Ian Beer of Google Project Zero
CVE-2016-4653 : Ju Zhu of Trend Micro
CVE-2016-4582 : Shrek_wzw and Proteas of Qihoo 360 Nirvan Team
Kernel
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to cause a system denial of service
Description: A null pointer dereference was addressed through improved input validation.
CVE-2016-1865 : Marco Grassi (@marcograss) of KeenLab (@keen_lab), Tencent, CESG
Libc
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution
Description: A buffer overflow existed within the 'link_ntoa()' function in linkaddr.c. This issue was addressed through additional bounds checking.
CVE-2016-6559 : Apple
Entry added January 10, 2017
libc++abi
Available for: OS X El Capitan v10.11 and later
Impact: An application may be able to execute arbitrary code with root privileges
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4621 : an anonymous researcher
libexpat
Available for: OS X El Capitan v10.11 and later
Impact: Processing maliciously crafted XML may lead to unexpected application termination or arbitrary code execution
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-0718 : Gustavo Grieco
LibreSSL
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple issues existed in LibreSSL before 2.2.7. These were addressed by updating LibreSSL to version 2.2.7.
CVE-2016-2108 : Huzaifa Sidhpurwala (Red Hat), Hanno Böck, David Benjamin (Google), Mark Brand and Ian Beer of Google Project Zero
CVE-2016-2109 : Brian Carpenter
libxml2
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: Multiple vulnerabilities in libxml2
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2015-8317 : Hanno Boeck
CVE-2016-1836 : Wei Lei and Liu Yang of Nanyang Technological University
CVE-2016-4447 : Wei Lei and Liu Yang of Nanyang Technological University
CVE-2016-4448 : Apple
CVE-2016-4483 : Gustavo Grieco
CVE-2016-4614 : Nick Wellnhofer
CVE-2016-4615 : Nick Wellnhofer
CVE-2016-4616 : Michael Paddon
Entry updated June 5, 2017
libxml2
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: Parsing a maliciously crafted XML document may lead to disclosure of user information
Description: An access issue existed in the parsing of maliciously crafted XML files. This issue was addressed through improved input validation.
CVE-2016-4449 : Kostya Serebryany
libxslt
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: Multiple vulnerabilities in libxslt
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-1683 : Nicolas Grégoire
CVE-2016-1684 : Nicolas Grégoire
CVE-2016-4607 : Nick Wellnhofer
CVE-2016-4608 : Nicolas Grégoire
CVE-2016-4609 : Nick Wellnhofer
CVE-2016-4610 : Nick Wellnhofer
Entry updated April 11, 2017

Audio
Available for: OS X El Capitan v10.11 and later
Impact: Parsing a maliciously crafted audio file may lead to the disclosure of user information
Description: An out-of-bounds read was addressed through improved bounds checking.
CVE-2016-4646 : Steven Seeley of Source Incite working with Trend Micro's Zero Day Initiative
bsdiff
Available for: OS X El Capitan v10.11 and later
Impact: A local attacker may be able to cause unexpected application termination or arbitrary code execution
Description: An integer overflow existed in bspatch. This issue was addressed through improved bounds checking.
CVE-2014-9862 : an anonymous researcher
CFNetwork
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to view sensitive user information
Description: A permissions issue existed in the handling of web browser cookies. This issue was addressed through improved restrictions.
CVE-2016-4645 : Abhinav Bansal of Zscaler Inc.
CFNetwork Credentials
Available for: OS X El Capitan v10.11 and later
Impact: An attacker in a privileged network position may be able to leak sensitive user information
Description: A downgrade issue existed with HTTP authentication credentials saved in Keychain. This issue was addressed by storing the authentication types with the credentials.
CVE-2016-4644 : Jerry Decime coordinated via CERT
CFNetwork Proxies
Available for: OS X El Capitan v10.11 and later
Impact: An attacker in a privileged network position may be able to leak sensitive user information
Description: A validation issue existed in the parsing of 407 responses. This issue was addressed through improved response validation.
CVE-2016-4643 : Xiaofeng Zheng of Blue Lotus Team, Tsinghua University; Jerry Decime coordinated via CERT
CFNetwork Proxies
Available for: OS X El Capitan v10.11 and later
Impact: An application may unknowingly send a password unencrypted over the network
Description: Proxy authentication incorrectly reported HTTP proxies received credentials securely. This issue was addressed through improved warnings.
CVE-2016-4642 : Jerry Decime coordinated via CERT
CoreGraphics
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to elevate privileges
Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed through improved input validation.
CVE-2016-4652 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative
CoreGraphics
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: A memory corruption issue was addressed through improved memory handling.
CVE-2016-4637 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
FaceTime
Available for: OS X El Capitan v10.11 and later
Impact: An attacker in a privileged network position may be able to cause a relayed call to continue transmitting audio while appearing as if the call terminated
Description: User interface inconsistencies existed in the handling of relayed calls. These issues were addressed through improved FaceTime display logic.
CVE-2016-4635 : Martin Vigo
Graphics Drivers
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A memory corruption issue was addressed through improved input validation.
CVE-2016-4634 : Stefan Esser of SektionEins
ImageIO
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4629 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
CVE-2016-4630 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
ImageIO
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to cause a denial of service
Description: A memory consumption issue was addressed through improved memory handling.
CVE-2016-4632 : Evgeny Sidorov of Yandex
ImageIO
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4631 : Tyler Bohan of Cisco Talos (talosintel.com/vulnerability-reports)
ImageIO
Available for: OS X El Capitan v10.11 and later
Impact: Processing a maliciously crafted image may lead to arbitrary code execution
Description: A memory corruption issue was addressed through improved memory handling.
CVE-2016-7705 : Craig Young of Tripwire VERT
Entry added November 30, 2017
Intel Graphics Driver
Available for: OS X El Capitan v10.11 and later
Impact: A malicious application may be able to execute arbitrary code with kernel privileges
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4633 : Marco Grassi (@marcograss) of KeenLab (@keen_lab), Tencent
IOHIDFamily
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A null pointer dereference was addressed through improved input validation.
CVE-2016-4626 : Stefan Esser of SektionEins
IOSurface
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: A use-after-free was addressed through improved memory management.
CVE-2016-4625 : Ian Beer of Google Project Zero
Kernel
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to execute arbitrary code with kernel privileges
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-1863 : Ian Beer of Google Project Zero
CVE-2016-4653 : Ju Zhu of Trend Micro
CVE-2016-4582 : Shrek_wzw and Proteas of Qihoo 360 Nirvan Team
Kernel
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to cause a system denial of service
Description: A null pointer dereference was addressed through improved input validation.
CVE-2016-1865 : Marco Grassi (@marcograss) of KeenLab (@keen_lab), Tencent, CESG
Libc
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution
Description: A buffer overflow existed within the 'link_ntoa()' function in linkaddr.c. This issue was addressed through additional bounds checking.
CVE-2016-6559 : Apple
Entry added January 10, 2017
libc++abi
Available for: OS X El Capitan v10.11 and later
Impact: An application may be able to execute arbitrary code with root privileges
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4621 : an anonymous researcher
libexpat
Available for: OS X El Capitan v10.11 and later
Impact: Processing maliciously crafted XML may lead to unexpected application termination or arbitrary code execution
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-0718 : Gustavo Grieco
LibreSSL
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple issues existed in LibreSSL before 2.2.7. These were addressed by updating LibreSSL to version 2.2.7.
CVE-2016-2108 : Huzaifa Sidhpurwala (Red Hat), Hanno Böck, David Benjamin (Google), Mark Brand and Ian Beer of Google Project Zero
CVE-2016-2109 : Brian Carpenter
libxml2
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: Multiple vulnerabilities in libxml2
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2015-8317 : Hanno Boeck
CVE-2016-1836 : Wei Lei and Liu Yang of Nanyang Technological University
CVE-2016-4447 : Wei Lei and Liu Yang of Nanyang Technological University
CVE-2016-4448 : Apple
CVE-2016-4483 : Gustavo Grieco
CVE-2016-4614 : Nick Wellnhofer
CVE-2016-4615 : Nick Wellnhofer
CVE-2016-4616 : Michael Paddon
Entry updated June 5, 2017
libxml2
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: Parsing a maliciously crafted XML document may lead to disclosure of user information
Description: An access issue existed in the parsing of maliciously crafted XML files. This issue was addressed through improved input validation.
CVE-2016-4449 : Kostya Serebryany
libxslt
Available for: OS X Mavericks v10.9.5, OS X Yosemite v10.10.5, and OS X El Capitan v10.11 and later
Impact: Multiple vulnerabilities in libxslt
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-1683 : Nicolas Grégoire
CVE-2016-1684 : Nicolas Grégoire
CVE-2016-4607 : Nick Wellnhofer
CVE-2016-4608 : Nicolas Grégoire
CVE-2016-4609 : Nick Wellnhofer
CVE-2016-4610 : Nick Wellnhofer
Entry updated April 11, 2017
Login Window
Available for: OS X El Capitan v10.11 and later
Impact: A malicious application may be able to gain root privileges
Description: A type confusion issue was addressed through improved memory handling.
CVE-2016-4638 : Yubin Fu of Tencent KeenLab working with TrendMicro's Zero Day Initiative
Login Window
Available for: OS X El Capitan v10.11 and later
Impact: A malicious application may be able to execute arbitrary code leading to compromise of user information
Description: A memory corruption issue was addressed through improved input validation.
CVE-2016-4640 : an anonymous researcher working with Trend Micro's Zero Day Initiative
Entry updated November 16, 2016
Login Window
Available for: OS X El Capitan v10.11 and later
Impact: A malicious application may be able to execute arbitrary code leading to the compromise of user information
Description: A type confusion issue was addressed through improved memory handling.
CVE-2016-4641 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative
Login Window
Available for: OS X El Capitan v10.11 and later
Impact: A local user may be able to cause a denial of service
Description: A memory initialization issue was addressed through improved memory handling.
CVE-2016-4639 : Yubin Fu of Tencent KeenLab working with Trend Micro's Zero Day Initiative
OpenSSL
Available for: OS X El Capitan v10.11 and later
Impact: A remote attacker may be able to execute arbitrary code
Description: Multiple issues existed in OpenSSL. These issues were resolved by backporting the fixes from OpenSSL 1.0.2h/1.0.1 to OpenSSL 0.9.8.
CVE-2016-2105 : Guido Vranken
CVE-2016-2106 : Guido Vranken
CVE-2016-2107 : Juraj Somorovsky
CVE-2016-2108 : Huzaifa Sidhpurwala (Red Hat), Hanno Böck, David Benjamin (Google), Mark Brand and Ian Beer of Google Project Zero
CVE-2016-2109 : Brian Carpenter
CVE-2016-2176 : Guido Vranken
QuickTime
Available for: OS X El Capitan v10.11 and later
Impact: Processing a maliciously crafted SGI file may lead to arbitrary code execution
Description: A memory corruption issue was addressed through improved input validation.
CVE-2016-4601 : Ke Liu of Tencent's Xuanwu Lab
QuickTime
Available for: OS X El Capitan v10.11 and later
Impact: Processing a maliciously crafted Photoshop document may lead to unexpected application termination or arbitrary code execution
Description: A memory corruption issue was addressed through improved input validation.
CVE-2016-4599 : Ke Liu of Tencent's Xuanwu Lab
QuickTime
Available for: OS X El Capitan v10.11 and later
Impact: Processing a maliciously crafted FlashPix Bitmap Image may lead to unexpected application termination or arbitrary code execution
Description: Multiple memory corruption issues were addressed through improved memory handling.
CVE-2016-4596 : Ke Liu of Tencent's Xuanwu Lab
CVE-2016-4597 : Ke Liu of Tencent's Xuanwu Lab
CVE-2016-4600 : Ke Liu of Tencent's Xuanwu Lab
CVE-2016-4602 : Ke Liu of Tencent's Xuanwu Lab
QuickTime
Available for: OS X El Capitan v10.11 and later
Impact: Processing a maliciously crafted image may lead to arbitrary code execution
Pages For Mac El CapitanDescription: A memory corruption issue was addressed through improved input validation.
CVE-2016-4598 : Ke Liu of Tencent's Xuanwu Lab
Safari Login AutoFill
Available for: OS X El Capitan v10.11 and later
Impact: A user's password may be visible on screen
Description: An issue existed in Safari's password auto-fill. This issue was addressed through improved matching of form fields.
CVE-2016-4595 : Jonathan Lewis from DeARX Services (PTY) LTD
Sandbox Profiles
Available for: OS X El Capitan v10.11 and later
Impact: A local application may be able to access the process list
Description: An access issue existed with privileged API calls. This issue was addressed through additional restrictions.
CVE-2016-4594 : Stefan Esser of SektionEins
OS X El Capitan v10.11.6 includes the security content of Safari 9.1.2.
Check compatibilityYou can upgrade to OS X El Capitan from OS X Snow Leopard or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008)
MacBook Air introduced in late 2008 or later
MacBook Pro introduced in mid 2007 or later
Mac mini introduced in early 2009 or later
iMac introduced in mid 2007 or later
Mac Pro introduced in early 2008 or later
Xserve models introduced in early 2009
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X El Capitan, the installer will let you know.
Make a backupBefore installing any upgrade, it's a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Pages Per Mac El CapitanGet connectedIt takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power. 
Download OS X El CapitanFor the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.
If you still need OS X El Capitan, use this link: Download OS X El Capitan. A file named InstallMacOSX.dmg will download to your Mac.
Install the macOS installerDouble-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin installationAfter installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X El Capitan.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed. 
Allow installation to completePlease allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.
Learn moreOS X El Capitan won't install on top of a later version of macOS, but you can erase your disk first or install on another disk. 
You can use macOS Recovery to reinstall macOS.