I'm looking at buying a used Traktor Z1. I was told that since the Z1 comes with a serial number, I can just download a copy of the Traktor software and register it with the said number. Then I'll have Traktor LE 2. Will that work? I'm worried that Native Instrument might not allow the same serial number to be used for multiple registrations. What if the old owner keeps using his copy of Traktor LE?