Unable to update 2015 iMac running Mojave 10.14.6 to macOS Monterey

What is your process to initiate this upgrade?

Are you starting at System Preferences > Software Update?

Try download the upgrade installer directly from the App Store?

That download is located here:

https://apps.apple.com/us/app/macos-monterey/id1576738294

Use Safari to download this. Other browsers may not work.

Also, please see: If an error occurred while updating or installing macOS - Apple Support

Check your Applications folder for the “Install macOS Monterey” application and delete all copies.

Empty the trash, restart the Mac and try the download again.

I am having the same issue...I can't update several apps without updating to Monterey. Very frustrating!

I was finally able to get Monterey installed using the Option-Command-R keys in macOS recovery mode! Thank you for helping!

You're welcome.

Thanks for letting us know how you resolved this. 👍🏽