Unable to update to 12.3

[create90mph]

Having trouble updating my 2019 iMac to 12.3 - so far I’ve tried restarting my Mac, resetting NVRAM and trying to update frame safe mode. Each attempt has failed and I get a message “failed to prepare the software update”

any advice on how I can proceed would be greatly appreciate.

 

[create90mph]

I also just tried updating from recovery mode... that did not work either.

 

[DeltaMac]

Download the Monterey installer.
Use that to create an external bootable installer (it uses the createinstallmedia command from inside the installer app)
There is an Apple support article with full instructions on how to do that: https://support.apple.com/en-us/HT201372

 

[create90mph]

Dowloaded the installer from the App Store and am getting this message in the Terminal:

"Applications/Install macOS Monterey.app does not appear to be a valid OS installer application."

 

[mi7chy]

Got the same error upgrading MBA M1. Updating from recovery mode estimated several hours since it wanted to download the update again. Ended up creating USB memory stick installer from 12.3 update that was already present and completed successfully in ~1 hour.

 

[DeltaMac]

Dowloaded the installer from the App Store and am getting this message in the Terminal:

"Applications/Install macOS Monterey.app does not appear to be a valid OS installer application."

That appears to be a typing error. You do need to have the escapes on each space in a name (notice the backslashes in the commands when a name has spaces. Those need to be there!)