Regarding the Plentiful Paradox Package, anyone know how to activate the DLC that comes with the Magicka Collection? According to the product page, the following is included:

Magicka Vietnam
Magicka Wizard Survival Kit
Magicka Caverns and Marshlands
Magicka Nippon
Magicka Final Frontier
Magicka Frozen Lake
Magicka Watch Tower
Magicka Robe Bundle

However, after activating the key in Steam, only the base game is available - none of the listed DLC seems to be unlocked. Thanks for any help!