Q: How can I run Adobe Acrobat XI on macOS Catalina?
A: Adobe Acrobat XI will not install nor run on macOS Catalina 10.15.
You can find more info about this in the following article on Adobe’s website:
As an alternative to Adobe Acrobat XI on Catalina, we suggest you try Qoppa’s PDF editor called PDF Studio. We have tested PDF Studio version 2019 on the latest macOS and were able to confirm that it is compatible with macOS Catalina (version 10.15) .