Quote - Yes, I am logged in, goto checkout, then I'm asked to fill in my name and adress, and also postal code, which must be the same as in the code for the credit card.

Otherwise, I can't continue and download the file. 

The same thing happened to me. Try filling in your address and details in the 'my account' area and saving it, rather than filling it in when checkout asks for it. That's the only way I could get past that point.