Cant open Indesign cc

You should also try start the computer in Safe Mode which loads only essential processes and see if InDesign will start. That will tell you if the problem is a conflict with other software running when InDesing is loaded.

Is it a MAC on which you are trying. See if InDesign has disk access

https://macpaw.com/how-to/full-disk-access-mojave

If nothing works then using the creative cloud cleaner tool as already suggested would be a good thing to try. Wipe off everything Adobe using that tool and start afresh.

-Manan

Have you tried to reset InDesign Preferences on startup? There is a very detailed support article from Mike Witherell here outlining different troubleshooting scenarios for WIN and Mac: https://community.adobe.com/t5/indesign-discussions/reset-indesign-preferences-and-other-troubleshooting/td-p/11990234

If everything fails you can try the CC Cleaner Tool. It is mentioned in the article above and can be directly found here: https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html