can't update mac0s

Is your system compatible with Monterey? If the answer is yes, you can try restarting the mac, Booting in safe mode, or go to the apple site where you can download the older versions of macOS. Tick monterey, it will take you to the app store page where you can download monterey (again, only if your mac supports monterey)

What model and year Mac?

How long have you been trying?

Have you tried restarting the Mac?

Open the Terminal app and enter the command

softwareupdate --fetch-full-installer --full-installer-version 12.3.1

and hit Return key. What is returned?

It should start download the current Monterey version, 12.3.1. It will be in your Applications folder. Terminal will give progress of the download.

Hi,

Are you in Recovery Mode or Software Update? If Software Update, try booting into Safe Mode: How to use safe mode on your Mac - Apple Support and see if the issue persists there.