There's been some complications but they are being sorted out. We really hope that we can get the Steam to GOG key transformation out of the door today. Players who didn't use their Steam key can already play via GOG.
Should work now. Will only work on Steam keys that were created before the release of the game, i.e. Alpha and Beta keys.
Is there any way to get GoG key without revoking the Steam key? First of all, I kinda value my good account standing on Steam and usually after 2 or 3 revoked keys they issue ban for key usage and there is no appeal. Second, I'd like to keep my steam copy. And third, since I have Divinity Anthology and DK on GoG I'd love to add DOS as well.