Apple Releases Mac OS X 10.11.2 El Capitan Beta 3

Apple Releases Mac OS X 10.11.2 El Capitan Beta 3

Today, Apple rolled out yet another iteration of the minor update to Mac OS X, Mac OS X 10.11.2 El Capitan Beta 3. They seem to be doing this weekly now, which is a really fast pace, even for Apple.

Mac OS X 10.11.2 El Capitan Beta 3 comes alongside iOS 9.2 Beta 3, tvOS 9.1 Beta 2, and Xcode 7.2 Beta 3.

Mac OS X 10.11.2 El Capitan Beta 3 Release Notes

OS X El Capitan 10.11.2 build 15C40a Seed Notes


The OS X El Capitan 10.11.2 update improves the stability, compatibility, and security of your Mac.


Installation Instructions

Please be aware that you will not be able to revert back to your previous system after updating. Please install this update on a system you are prepared to erase if necessary.


You can install this update using the OS X Software Update Seed Configuration Utility:


  • If you have already installed the new “OS X Software Update Seed Configuration Utility”, choose “Software Update” from the Apple menu. Otherwise, proceed with the following steps.

  • Log into your Apple Developer account and download the “OS X Software Update Seed Configuration Utility”.

  • After running the installer, the Mac App Store will open automatically. Click on the Updates panel and the latest version of OS X seed will now be available for download.

  • When a newer seed build is available, you will receive a notification to update from the Mac App Store. Click the notification to begin the installation. New seed notes will be posted in the Mac Dev Center.

  • To stop receiving new seed builds, go to the App Store in System Preferences and where it says “Your computer is set to receive pre-release Software Update seeds”, click on the “Change…” button.


Note: If you are using a computer which gets its updates from a local Software Update server, the OS X Software Update Seed Configuration Utility will reconfigure your machine to use Apple’s Software Update servers. Your computer must be able to connect to Apple’s Software Update servers to install the seed. We recommend that you remove any Configuration Profile that specifies a local Software Update server before installing the OS X Software Update Seed Configuration Utility.


Focus Areas












Bug Reporting


This build is being provided to you for testing and development purposes. Should you encounter any problems, please submit a bug report using the online Bug Reporter at Please make sure to include “10.11.2 (15C40a)” in the bug title and description. This information will ensure that your bug is processed quickly.


When submitting a bug report, please make sure to include a Summary, Steps to Reproduce, Expected Results, Actual Results, and the diagnostic output generated by running ‘sudo sysdiagnose’ in the Terminal.


For complete instructions on submitting bug reports, please visit the Bug Reporting page at


Thank you for your support,

Worldwide Developer Relations

Apple, Inc.

About the author
Rich Woods

Being a computer programmer wasn't enough to fulfill his love of technology. In 2013, Rich founded For the Love of Tech and has been writing about his love of tech ever since.