Mac OS X 10.15 Catalina released here https://www.apple.com/macos/catalina/

Band-in-a-Box 2019 is 64 bit, and Catalina compatible.

Any Band-in-a-Box versions 2018 or earlier are 32 bit, and won't run on Catalina (since Catalina only runs 64 bit app).

Catalina features like Sidecar (extra monitor using iPad or AppleTV) work well with Band-in-a-Box 2019. Band-in-a-Box 2019 runs great on Catalina and there are no known Catalina/Band-in-a-Box issues.
_________________________


Have Fun!
Peter Gannon
PG Music Inc.