Please refer to the links below.
- Creative Cloud applications unexpectedly revert to trial mode | CCM, CS6
- Creative Cloud applications revert to trial mode after an update to CC 2015
Also please ensure that you are using the right adobe ID to sign in.
Hope this will help you.
You are most welcome. Glad to know your issue is resolved.
I don't know if its because I'm french but I still don't understand those steps...