Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General D:OS Special DLC

From purely greedy reasons.. :P do I really need to buy "boxed Divinity Anthology"? I already have DKS and DD on Steam (and ED on DVD).

Got BD in cart but just checked if that is not released on Steam as preorder bonus for D:OS (many games do that) and found "special DLC" but it needs voucher code which I don't get (and I think not even for Anthology on Steam as it looks like collection of games I already have).