Nothing worked for me except when I did this solution: (Make sure you have the right Library folder, that was the key) "I FOUND SOMETHING THAT WORKED FOR MAC USERS!!! Windows fix is here: https://www.youtube.com/watch?v=SGYSZ... ( 1. Open Finder 2. Go to /Library/Application Support/Adobe (type that in the "Go to folder" search tab WITHOUT a ~ because ~/Library is the WRONG Library folder) 3. Delete the SLCache and SLStore folders (and delete SLStore_v1 if that's there too). 4. Right-click on the Adobe folder that you were just in, and click Get Info. 5. Click the lock and enter the admin name+password. 6. Add your active user account by clicking the + button and clicking Select. 7. Give Read & Write permissions to everyone listed at the bottom of the window. 8. IMPORTANT: Click the gear button at the bottom of the window and click Apply to Enclosed Items. 9. Click the lock to lock the folder once more. 10. Open any CC application; this should work now! (After maybe one "Sign-In Required," that is, but it shouldn't pop up more than once!)"
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