King’s Bounty: Armored Princess – a Bagful of New Years’ Presents!

[Avi]

Just found this addon but I cant get it to work for me. After clicking the .exe it installs fine. Then I load the game and it shows campaign ''gift bag'' available so I try and select it but the check mark stays grayed out, making it unable for me to work.
I run the game under steam. Any help is appreciated cuz I like to start a new game with the new items if possible. Thanks in advance!