If you bought from audio deluxe, register the serial number in your Toontrack account and download the full product installer. Uninstall the demo and install the full product. You should then be able to authorize as usual.
I may be of help here as i had the identical problem .
Make sure you also ditch the demo installer from your download are, as if like me you may reload the demo as they look very similar.
So to be sure delete the old installer too then un install and then do your new install.
