There are several threads on the forum addreasing this issue. Here’s one of them Mojave or Catalina: how to get the BeatBuddy Manager (BBM) installed and working
And another good one: macOS BBManager error when opening - #28 by sg315er
Probably a key takeaway for Catalina users is to
- Delete the BeatBuddy Manager (BBM) app
- Empty Trash
- Install BBM app in Applications folder
- Reboot the Mac
- Launch BBM and if it opens, all is good but if not, use the ctrl-click method to get the Mac to recognize that you are authorizing the use of the BBM