I'm having a problem with the new DLC. It's grayed out on the opening screen even after I bought it, and if I click on the grey to buy it again it just takes me to the store where it says I already have in. I've tried syncing and updating downloads with no luck. Anyone having a similar problem or ideas on how to fix it?

I am having the same issue. The DLC appears greyed out with a red X on it on the title screen.

I just submitted a support ticket with GOG. Will update you once I get a response if there's any solution. Bummed out was hoping to play this my Friday Night :(

Actually just figured it out. Looks like you need to enable it manually. See attached

Yep, that did it. Thanks friend, I owe you a beer.