DLC problem

Hi,

I bought the saunamen & legendary snails shoulderpad dlc.
But they don't work, there is no option to turn them on or off in the options menu like shown on the pictures when you buy it on the steam store.
I have 2 confirmation e-mails of my purchase.
I also checked the DLC menu in my steam library, the DLC's show up there but still, they don't work in game.
What do i do?

Greetz