|System||OSX||Mac OS 10.12 (Sierra) and previous version|
After system updates, it often happens that previously installed software becomes incompatible.
The roaringapps.com website lists all 32bit software that will NOT be compatible with Catalina Mac OS 10.15: https://roaringapps.com/collections/list-of-32-bit-macos-apps
This article explains how to prevent your Mac from automatically upgrading.
Author : MIESCH Alexander