It's currently impossible to join this giveaway because the base game has profile features limited. The Steam API doesn't report profile feature limited games and because of that Steamgifts can not check if a user owns the base game.

Thanks for the info.
Kinda fucked up though for anyone who would be really interested. Not just for this dlc

Hello. Im fine with your step. Is my fault and support said i have to get permission from all people that didnt get good key to delete it. They said no, soo i just give up. Have nice day :)