This Solution provides compatibility information for Big Business and macOS 10.15 Catalina, available October 7, 2019. (6951)
Big Business 12 is supported on macOS Catalina. To install you will need to go System Preferences, Security, and click Open Anyway.
Big Business 11 is not supported on macOS Catalina. Big Business 11 is certified compatible with macOS High Sierra and is supported on macOS Mojave.
Big Business 10 is not supported on macOS Catalina. Big Business 10 is certified compatible with macOS 10.12 Sierra.