Did you go to
here (vB-germany users click
here) and enter your email address, to show us that you are licensed?
You will need to use your customer number and password (which will be in the email you got when you paid for your license) to access that page. Please note that your email is case sensitive.
We don't have much control over the licensing system beyond that point, so if that doesn't work you'll have to e-mail
contact@vbulletin.com.