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I'm having trouble updating to macOS15. It downloads but doesn't complete the installation - gets stuck with 3 minutes to go. A

I'm having trouble updating to macOS15. It downloads but doesn't complete the installation - gets stuck with 3 minutes to go. Any suggestions?






iMac 21.5″, macOS 11.3

Posted on Oct 29, 2021 1:14 PM

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Question marked as Top-ranking reply

Posted on Nov 3, 2021 12:58 PM

Installations of macOS may inform you that there are __ minutes remaining, and it can take far longer than that with little to no apparent progress. If you had sufficient storage remaining on your Mac, then it is a waiting game for the completion that is difficult for the impatient.

5 replies

Nov 3, 2021 1:08 PM in response to mlcatrust

If you still haven't been successful in installing Monterey read and try the following:

I've had better luck from the Safe Mode because I evidently have some 3rd party software that interferes with the installation so try the following:

#1 - boot into Safe Mode according to Start up your Mac in safe mode - Apple Support.

NOTE: Safe Mode boot can take up to 3-5 minutes as it's doing the following; 
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts 
• Deletes font caches, kernel cache, and other system cache files

#2 - go to the System/Software Update preference pane and begin the download.

#3 - run the installer from the Safe Mode.


I'm having trouble updating to macOS15. It downloads but doesn't complete the installation - gets stuck with 3 minutes to go. A

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