I have the Pro 6.2 and Daz does not issue any addition serial numbers other then the one in the magazine.   Usually, this means they won't recognize it for future upgrade pricing.  I got Carrara in 3D Magazine, installed and registered it, then proceeded to purchase the upgrade to Carrara 3.  I must not of been the only one because shorly after that they announced you were not eligable  for upgrade purchase with the free magazine version.  Glad I jumped on it when I did!