Apple has released the GM Candidate build of OS X El Capitan for Mac users participating in the Mac Developer Beta and OS X Public Beta programs. Additionally, Apple has announced that OS X 10.11 El Capitan will be available to the general public on September 30 as as free download.
GM is short for Golden Master, indicating it is the final build in a software production cycle that will be released to the public.
In this case, the final build of OS X 10.11 arrives as 15A282b, and the download is available now from the Software Update function of the App Store. The update download is about 2GB and requires a reboot to complete installation of.
The GM update is rolling out now for Mac users in the developer beta program, though if you don’t find the update available in the Mac App Store, you can try refreshing the Updates tab, or using this trick to unveil the missing OS X beta updates by updating the catalog URL .
You can also find the OS X El Capitan GM candidate available to download through the “Purchases” tab of the App Store as seen here:
The general public will have access to OS X El Capitan as a free download on September 30.