"Develop module is disabled" , despite purchase

Hi guys ! I wanted do open up my Lightroom CC (2015) but there is just one problem. Everytime I get the message:

"Develop module is disabled. Please purchase a membership or license to reactivate the Develop module.
   if you have a serial number to enter, please sign out from the Help menu and sign in again, then cklick License This Software."

But I did purchase the package. Everytime I log out from Lightroom, and logging in aggain , I get the message:

"Thank you ! Congratulations on purchasing Creative Cloud Photography using your Adobe ID **********@****.com
Click continue to enjoy the licensed copy of your software" .

So, I do press "Continue" and it gives me the same thing again ... "Develop module is disabled. Please purchase........."

I allready tried to do this one: Lightroom 5.5 "Develop module is disabled. Please renew your membership to reactivate the Develop module"
And other ones.

Thanks for your help!