Click Run to start the disk checking and repair process.Choose your startup disk from the sidebar and click on First Aid.When the macOS Utilities window appears, select Disk Utility and click Continue.Once you see the Apple logo or a spinning globe, release the keys.This will boot your Mac into Recovery Mode. While the startup disk is waking up, press and hold the Command and R keys together.You can use Disk Utility’s First Aid in macOS Recovery to check for and repair disk errors that might be causing verification failures. Try again to update or install your macOS.Either on the first or second login window, you should see Safe Boot in the menu bar, which confirms you are in Safe Mode.You might be asked to log in a second time. Turn on or restart your Mac and then immediately press and hold the Shift key until the login window appears.Now try once again to update or install your macOS.Once the login window appears, you should see Safe Boot in the menu bar, indicating that you are in Safe Mode. Your Mac will then restart automatically.Continue holding the Shift key and then click Continue in Safe Mode.Select the volume you wish to boot from. ![]()
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