I get it. I'm only 72 years old! We're friends again. And don't we look good for such "experienced" gentlemen!?
I feel the pain. I have had any number of software packages I relied on for years go away because the developer decided not to keep up with Apple advances. I used the Microsoft Mac mail client Entourage from 2000 until I had to buy a new iMac a year ago. It can no longer install on newer Macs because MS turned off the activation server needed to set up the program. It's not just Macs; I've talked to plenty of Windows users in the same boat we share.
Have you checked for Print Shop updates? It is in the Mac App Store:
https://apps.apple.com/us/app/the-print-shop/id934914736?mt=12
That doesn't say if that version is 32- or 64-bit but, if you open that App store listing and scroll down, there is a "compatibility" section that, if it is 64-bit, should say "Runs on this Mac" when you view it from Catalina. The comments say it is not a remake of the older version--new distributor apparently. Could be a dealbreaker. Anyway, see if their site has a trial version.
You can also look for other apps with a similar function there.
See what it says ad post back. I need to make some calls now but I'll try to check in later this evening. I'm on US Pacific Daylight time. Maybe my septuagenarian brain will have more ideas after my nap and a glass of good beer!