Rocksmith Tools Launcher is compatible with macOS 10.14 (Mojave) and below ...   STOP - DO NOT UPGRADE to macOS 10.15 (Catalina), yet - looking for compatibility testers ...   There's a new application for Mac users named Rocksmith Tools Launcher.  The application includes and launches the Mac Wineskin ported versions of: CustomsForge Song Manager (CFSM) Custom Song Creator for Rocksmith (Rocksmith Toolkit), aka 'the toolkit' Custom Game Toolkit (CGT)