So, what exactly is your authorization problem?
The way our works is Toontrack gives you 4 total authorizations to freely use. For example, say I authorize my studio computer and a laptop. 2 total authorizations. Then I get a new laptop. Ok. I go to my Toontrack account, select my product, and remove the old laptop (click on the 'X' in the top right of the authorization I want to remove). This frees up a slot so I can use the 3rd out of 4 authorizations.
Feel free to ask more questions or clarify what trouble you are having.