If you email support at larian.com with your SecuROM key from the GamersGate (etc) version of D2:ED / DKS / FoV, they can provide you with a voucher for D2:DC from the Larian Vault.

For DRM free digital releases (like from Amazon.com) Larian doesn't have any way to verify purchases. I think in that case you may need to contact the digital distributor to see if / when they will be updating their listing /download for Divinity 2.

Got my key for Larian Vault. It's great that they give ppl who bought orginal D2 new version.

The only downside is that I have to make another account for it. I like to have all my games in one place lol :)