I've been using InDesign CS6 and just updated the InDesign app on my Creative Cloud, but it won't open. It still appears as "up to date" on Creative Cloud, but below alert keeps popping up. Does CS6 no longer work?
The “latest version” of the operating system is MacOS 11. MacOS 11 is incompatible with CS6 (Apple continues to make new OS versions incompatible with existing applications – nothing that Adobe can do anything about). You will need to use InDesign 16.