joyMIDI v0.5a software - fix some issue in macOS Catalina

joyMIDI v0.5a software - macOS Download

The solution about apps not opening in Catalina 

https://www.reddit.com/r/MacOS/comments/c68gh9/solution_for_all_apps_not_opening_in_catalina/

Will it help if you temporary disable the macOS Gatekeeper. To do so, launch terminal and type: sudo spctl --master-disable

Then go to System Preferences -> Security & Privacy and set “Allow apps download from:” to “Anywhere”