Video Showing how to solve issue Mac stuck while shutting down or restarting: The simplest way to disable an app from launching on startup is from the Dock.
It will change the pause option into Cancel. There, you can find the details about the macOS version, click on “Software Update. Release the Shift key when you see the Apple logo. e you are still running a High Sierra and want to update the macOS (Security Update, iTunes, Safari. Once your Mac boots up after restarting, Open System Preferences. How to cancel mac update while restarting Keep pressing the power button to shut down your Mac.
