My question is:

How can I tell which expansions are currently installed? Any new quests or things I should look for? I bought the complete edition which includes Stormblood, A Realm Reborn, and Heavensward. Here's the reason why I'm so confused.

I had the launcher from the website from years ago but never got into it. However, here recently, I've been looking to join but it said I needed to get the code from Steam.

I went to Steam and bought the entire edition. Then took the registration codes and entered them into the Mog Station. Now I have two launchers. The one from Steam says it needs installing and the original one from the website magically says Stormblood and allows me to play without me actually installing it. I'm so confused and don't see any difference other than the intro movie.