Hello,
I've just bought the Music Production Suite 6. In the email I got the serial number for Guitar Rig 7 Pro as well. After I added it in Native Access, the notification said "You successfully registered Guitar Rig 7 LE". Guitar Rig 7 Pro doesn't appear in the Native Access list, only Guitar Rig 7 LE. When I enter "My products" from the account menu on NI site it says that I have "Guitar Rig 7 Pro for iZotope" registered to my account, so everything seems fine with the serial itself. However, the Pro version is unavailable in Native Access and it sees the serial as the serial for LE version anyway.