look here we go

if you never bought 2.0 xiv realm reborn , and only u ve download it through a free give away , then :
1-make a steam account
2-download steam application for your pc
3-pruschace arr +heavensward preorder
4-go to the applicaton then to library> games>finalfantasy>heavensward>CD key

u ll find there your product registration for Arr+heavenswaord+preorder early access code

5-copy the early access code
6-go to mog station
7-go to my account then click on enter early access code
8-enter the code that you copied from your steam application for heavensward
9-tata code redeemed


you can play it on the launcher that u installed for windows or the one in the steam library
this process only for getting your code

P.Snly for EU