[mashlol]

Once you pre-order, you can log in via your battle.net account to get access. You can download the game from here: https://www.blizzard.com/en-us/download/

[thefounder]

The issue is that it doesn't show in my Battle.net launcher. After I downloaded the game I was asked to enter the Key. Anyway I've purchased a key from a 3rd party seller/marketplace(g2a).