Because CS6 is legacy software, it has strict hardware and software requirements:
Designed for Mac OS X 10.6.8 (Snow Leopard) or 10.7 (Lion) . Adobe Master Collection CS6 for Mac Free Download
Premiere Pro CS6, After Effects CS6, SpeedGrade, and Encore. Because CS6 is legacy software, it has strict
CS6 is the last version to contain 32-bit components. It will not run on macOS 10.15 (Catalina) or later, as these versions dropped support for 32-bit apps. Because CS6 is legacy software