I'm going to be replacing my harddrive soon, and I'm only taking a few folders with me as I can download all the other games I have through Steam/some other means.

I bought the original FFXIV, and I played through the beta and updated my game from the beta client. Once I switch out my new harddrive, how do I download the game again? I was looking through the Mog Station but I didn't see anything there. I don't have to rebuy the game, do I? Thanks.