I play on both Windows and PS4. What do I need to purchase?

You will need to purchase both the Windows and PS4 versions of the expansion to play the new content on both platforms. If you would like the exclusive bonus items from the Collector's Edition, you can get them with either the Windows or PS4 version as they will be linked to a single service account. Heavensward must be installed on the client to access the areas that will be added in Heavensward. If you are planning to log back in on a client that doesn't have Heavensward installed, make sure to log out in an FFXIV: ARR area.