I have a PS4 with a Heavensward-licensed FFXIV account. I'll be visiting a friend who also has a PS4 with a licensed FFXIV account, but they do not have Heavensward.
Will I be able to log into my account on their system? And if so, I assume I would end up upgrading their client to Heavensward, so would they then be able to continue using their non-Heavensward account to play?
Best Answer
When you registered your own PS4 copy to your Square Enix account, you would have been prompted to link your PlayStation Network account to that Square Enix account, which is a required step for all PS3 and PS4 players. As such, as long as you log into your friend's PS4 with your own PSN account, you should be able to log into the game and play just fine.
According to @Troyen in the comments, as of version 3.26, you need to download approximately 3GB of additional data the first time you log into a Heavensward-enabled account on an existing install of the game that has previously only been used for ARR.