This product is only compatible with the Steam version of FINAL FANTASY® XIV: A Realm Reborn. If you’ve purchased FINAL FANTASY® XIV: A Realm Reborn on Steam, then you must also purchase FINAL FANTASY® XIV: Endwalker on Steam to upgrade your existing account. Once you have purchased the game, you will be able to view your registration codes by selecting “FINAL FANTASY XIV” in your Steam “Library” and selecting “CD key” on the right-hand menu. The codes will always be accessible from this location should you ever need to reference them again. Please note that these codes will only work on Steam FINAL FANTASY XIV service accounts. For those playing “FINAL FANTASY XIV” for the first time, the registration codes can be registered during the game installation process