Hi guys. Today I bought Guitar Rig 7 pro from Plugin Boutique. Following the instructions I downloaded it to my Windows desktop PC. Now, when I try to download it to my Macbook, from the same account and using the "+Add serial" instruction, Native doesn't allow me to. It gives me an error message "This serial has already been registered..." . I don't know what I might be doing wrong. I would appreciate help with this. Thanks in advance.