Upgrade to Monterey not completing

Try to do the install from Safe Mode as lllaass suggested previously. 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.

Try booting to Safe Mode. That boot up takes minutes and clears caches and other things that may resolve your problem.

How to use safe mode on your Mac - Apple Support

Try installing when in Safe Mode

Do you have enough free disk space?

If upgrading from macOS Sierra or later, your Mac needs 26GB of available storage to upgrade.

Also uninstall any antivirus, internet security or "cleaning" apps before trying installing again.

Are you using File Vault to encrypt the disk? If so turn it off and then try after the de-encrypting is complete. That can take many hours.

Have you installed upgrade before using an installer provided by your employer? Are you connected to the internet when upgrading?

Cricket Liu wrote:

Hi folks!

I’ve been trying to upgrade my MacBook Pro (13”, 2020) to Monterey, using an installer provided by my company’s IT organization. The initial part of the upgrade seems to go well, but when it comes time to restart the laptop, the restart hangs. The screen only shows the pointer, and the laptop never restarts. If I force it to restart with the power button, it simply boots into MacOS 11.6.3 (the pre-upgrade version of the OS). If I run the installer again, the whole process repeats.

Does anyone have any suggestions on how to get the installation to complete?

Thanks!

Follow suggestions and guidance from previous posting first.

Verify with your employer / IT Department where exactly did they get this " Installer "

For information purposes - the Full Version of macOS Monterey 12.2 is approximately 12.2 GB in size ( yes, not a typo regarding size )