my digital goods are split between GOG and the Larian Vault which makes my OCD go ballistic. I REALLY would appreciate some kind of upgrade option on GOG so I can have my bloody ultimate edition in one place without being forced to pay $90.
GOG are still working on that... it's just taking them ages (no idea why). Getting the goods on larianvault is just an intermediate solution from Larian, so we at least have our digital goods until GOG sort out the situation on their side.
So eventually, you should get the digital goods on your GOG account as well.