The Support FAQ
If I redeem a Product Registration Code for the Standard Edition, can I later redeem a Product Registration Code for either the Digital Deluxe Edition or the Collector’s Edition using the same account?
Yes. You can always upgrade the edition associated with your account to an edition of higher value. For example, if you redeemed a Product Registration Code for the Digital Deluxe Edition, you can later redeem a Collector’s Edition Product Registration Code to that same account and enjoy the benefits associated with the Collector’s Edition.
You cannot however redeem multiple Product Registration Codes for the same edition to a single account. You also cannot redeem a Product Registration Code for an edition of lesser value than the edition already redeemed to your account.