Can't Play While Updating Post Trial.

I just upgraded my game from trial version to full version, after an annoying amount of time navigating through the mess of a website to activate the game key I purchased from the SE store, I am now stuck watching an update screen just to play the same version of the game I was already playing, I'm not even going to be playing the post heavensward content for quite a while and yet I have to wait until I finish downloading it all.

Very frustrating experience all round.

Sounds like you bought the complete edition so it's literally downloading Stormblood and Shadowbringers, the expansions you paid for :)

It has no idea when you're going to play it, so it's just downloading the game content right now.