Have ou tried this ? :
https://apple.stackexchange.com/questions/372084/macos-catalina-app-is-damaged-a...
Look in google the problem you got on Mac to see the fixes, because sure other people already had it before:
https://www.google.com/search?safe=active&hl=es&sxsrf=ACYBGNTqu_Te1vyiJJeBVJmYIY...