Quote Originally Posted by Rudens_RK View Post
So, my question is - am I stuck with Steam version and I should buy only Steam versions (since account is Steam-linked), or can I buy from a store I prefer?
Also - the free Heavensward key I got was from Square store, so that is confusing as well - if the versions will be delinked, will it mean I lose that one too?
If the game was originally purchased through Steam, ARR, then yes you will have to make sure that you buy all expansions through Steam to have them officially tied to that copy of ARR.

In regards to your free HW key, that isn't tied to the ARR at all as it was done through the SE store, not through Steam. Though if you wish to you can buy another copy of ARR to tie that with the HW and later you can buy Shadwbringers(Which comes with all previous expansions; Shadowbringers, Stormblood & Heavensward.) Like what the mod said above, there is the chance that it will be separated and that will prevent your Heavensward copy from being used on your Steam copy.