Is it possible to upgrade an account from Heroic to Deluxe edition just by paying directly the price difference between the two editions? I just bought the Heroic edition yesterday for 10€, but I’ve been thinking about it, and maybe I should have bought the Deluxe edition for 15€. Can I somehow pay the 5€ difference to upgrade to the Deluxe edition? Or is it completely impossible to upgrade this way (only by buying 2000 Gems and paying for the upgrade in the in-game store)?