Apple has released two new beta builds of OS X El Capitan, Developer Beta 8 for those registered in the official Mac Developer Program, and Public Beta 6 for Mac users in the Public Beta test program. The new builds arrive as 15A279b and 15A279d, respectively.
The update likely focuses on bug fixes and refinements, though no specific changes are mentioned in the App Store release notes, simply noting the update is recommended for all Mac users running the prior El Capitan versions.
Mac users who are participating in the beta programs for OS X 10.11 can find the latest updates available now from the Software Update mechanism of the Mac App Store.
If the Updates tab does not show the latest beta version, simply refresh it with Command+R shortcut to reveal the new beta build as an update.
The updates weigh in around 2.5GB and require a reboot to complete installation. As usual, it’s a good idea to back up a Mac before installing system software updates, particularly good practice for betas.
Development of the first public release of OS X El Capitan is likely close to wrapping up as the fall release schedule nears. Apple typically releases multiple betas before a final version, and often announces the availability date of new system software alongside the release of new iPhones. In this case, the iPhone 6s is expected to debut at an Apple event on September 9.
OS X El Capitan aims to improve the stability and performance of Mac system software, while simultaneously including a variety of new features and refinements.