Except for the system version, the issue and condition are same as Applications won’t open after downgrading - Apple Community.
On my end, it was solved by completely removing the app (Number, keynote and Page) based on https://macpaw.com/how-to/uninstall-apps-on-mac-os-x.
After restart the OS, the Number, keynote and Page can be opened
Mac mini, macOS 12.6
Hi,
You might have downloaded a newer version of the apps, that can only be opened in Ventura. When you downgrade to Monterey, you can try uninstalling the apps and installing them again from the App Store (to get the version specific to Monterey).
Hope this helps!
-Will
Apple's applications (e.g. Pages, Numbers, and Keynote) have minimum operating system requirements. The current versions (v13) require Monterey 12.3 or later, and if you downgraded to Monterey and updated it correctly, you should be running macOS 12.6.5 and have no issues with these applications.
Applications(iWork) won’t open after downgrading from Ventura to Monterey
