I had Adobe Acrobat Pro X on my Mac OS Sierra 10.12
I now updated it to Catalina OS 10.15.4 and it won't open.
I shouldn't have to buy a new app
Yes you should. Should have checked first.
You should..... no, let me stop, I'll be nice
This is going to get worse not better so I strongly suggest you check the status of ALL of your apps before ANY macOS upgrade, and budget for continual upgrading. It's all part of the Joy of Mac.
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You can revert to your old OS or get modern software that's compatible with Catalina. Your choice.
Acrobat Reader DC is free.
Acrobat Pro DC costs USD $14.99/month
Thanks, I'm not necessarily happy with my choices but at least it was a thought out and intelligent response.