Ok, then it seems that licensing on MyNetworking Portal has shut down, and you should use ASP now which doesn't use Registration IDs anymore (this is done per account, so that is why I can't tell you the exact procedure, just what to try).
If you don't have the option in the menu to generate evaluations in ASP, which I think are only available for Aruba Employees and Partners, you will need to get your evaluation key through your partner or Aruba SE.