Cubase upgrade from 6 to 7

I bought through eBay Cubase upgrade from 6 to 7
I installed the new software and then it was the matter with the dongle.
I tried to download the license and add it to my Donegal but I got a message that a full licenseā€¦
Can anyone help me and tell me what to do?
Sorry if there are spelling mistakes I translate via Google :blush:

Did it say the activation code has already been used?