Software developers have been given access to a new OS X 10.11.2 build in preparation for the update’s public release. This is the third beta of the 10.11.2 update that has been published.
The first two software betas didn’t bring any notable user-facing changes to the desktop OS, but Apple encourages developers to continue testing in areas like Wi-Fi connectivity, graphics capabilities, and built-in apps like Mail and Notes.
The new beta is available through the Updates tab of the Mac App Store for users already on the developer release channel, and through Apple’s developer website for those who are on a retail build.
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Are they fixing the problems that are keeping Aperture from working right with screen proofing?
Apple discontinued Aperture support in June of 2014. I doubt they will be developing any fixes to get it to work properly in El Cap. The Photos app has replaced both Aperture and iPhoto.