I have an iMac (21.5-inch, Late 2015) and upgraded to Monterey Version 12.6 with new Safari. "You can’t open the application “Safari.app” because this application is not supported on this Mac." appears when I try to open. How do I get Safari back?

CPettingill wrote:

I'm showing Version 16.0, created Sept. 8 2022, and modified Sept. 21, 2022 which is when I ran the upgrade. There are no other versions of Safari.

That sounds like it should be right.

I found this other thread, where apparently an issue with Safari 16.0 was resolved by reinstalling Monterey:

Monterey 12.6 update - Safari 16.0 is cra… - Apple Community

Reinstalling Monterey, as explained in this support document, does not erase your data; but do make sure to have a Backup, always.

How to reinstall macOS - Apple Support

Upgraded from which version of macOS?

Select the Safari application in the Applications folder and press Command-I. What does it show you, particularly about the version?

Also, you may have an old version of Safari lying somewhere in your mac.