How to downgrade from macOS High Sierra beta to the standard Sierra release
The macOS High Sierra beta is now well under way and many users have been giving it a test run to see what they make of it. However, it’s still pretty far from ready for mission-critical applications, and many bugs remain. If you’ve had enough of the beta experience for now and want to go back to the standard macOS 10.12 Sierra, then read on! Unfortunately, it is not possible to simply install Sierra over the top of a High Sierra install, not least because of the switch from HFS+ to APFS filesystems....