
MACOS UPDATER UPDATE
If Safe mode seems to fix the update so that most things are working properly again, and you can’t think of any incompatible extensions etc., then try restarting back into normal mode. Safe mode does two things which are likely to help: it clears a lot of caches and other things which could be causing your problem, and it disables third-party extensions which could also be an issue.
MACOS UPDATER FULL
This has changed in Catalina, and full details of what happens there are given in this article. In Mojave and High Sierra, starting up in Safe mode can take an age, as macOS performs a full check on all APFS snapshots first. Although in most cases you can release it earlier, that can risk performing a regular startup instead. Release the Shift key when the login window appears.As soon as you have pressed the Power button, press and hold down the Shift key on your keyboard.


Updating macOS is one of the most complex things that happens to your Mac. The first and most important action is not to rush at trying to fix it, or give up in disgust and start reverting to the last version you were running.

Instead of getting the latest, fixed and sweet-running version, Software Update dumps its ghost on you, and macOS is staggering along looking like it’s half dead. It happens: just when you think it’s safe to update macOS, it turns round and bites you on the bum.
