Greetings...
When I try activate my license for Designer 6.0.4, I also get a message that I have no valid license. My account shows active and paid through July 15. My license for Painter 2.0.3 works (yes, I know it is an older version).
I am not ready to upgrade to the 2017.1 version yet as I am in the middle of a project.
Cheers,
Michael