I have just updated to Big Sur in the hope InDesign 16.0.06.77 would open here! But it still crashes while opening the app (Which it started to to after the last update also on Catalina)! PLEASE HELP! Any ideas greatly appreciated!
Assuming you have suitable system requirements e.g. sufficient RAM and spare disk capacity.
I suggest you unistall InDesign, using the drop-down menu in the Creative Cloud app, and reinstall it again. If that doesnt solve the problem then unistall it once again and then run Adobe Cleaner before reinstalling InDesign again.