Allegro is what turned into PrintMusic. There are many threads on the internet about trying to make it work over Win 10/11. I've no idea if this will be helpful.

https://www.reddit.com/r/pcmasterrace/comments/1o7fn1b/my_2005_finale_allegro_notation_software_is_not/ 

Mike, it was a compatibility issue.  Thank you very much for the link.