HT203421: Troubleshooting the Mac App Store

Learn about Troubleshooting the Mac App Store
Stavin Chain

Q: Download of 10.12 Developer Preview fails.

Download of macOS 10.12 Developer Preview from the App Store fails to complete with the error, _An error has occurred_, in red letters. Signing out and signing back in changes nothing. Quitting and relaunching App Store changes nothing.


HOWEVER, booting into Recovery shows macOS 10.12 as available for re-install! But, if I try to "re-install," the time remaining on the "re-install" counts down to ... 3, 2, 1, 0, -1, -2, -3, -4, -5 ... till the time runs into negative minutes and I get tired of waiting and re-boot into El Capitan 10.11.6 Beta 3.


iMac (Retina 5K, 27-inch, Late 2014), 4 GHz Intel Core i7, 32 GB RAM, 2.11 TB free of 3.12 TB Fusion Drive



Posted on Jun 28, 2016 12:38 AM