Hello,
i cannot purchase Return to Castle Wolfenstein. i can click on the green cart with a * on it, the game apperars in the top right corner in the Cart for 1 second and then the cart is empty.
Other games seem to be ok, i have added them to the cart and everything with Wolfenstein as title remain in the cart but Return to Castle Wolfenstein won
t stay in the cart.
I tried different Computers/Laptops, WIN10, Debian and Ubuntu Linux:
always the same game won't stay in cart.
Any Help would be welcome.

The game is region locked in Germany.
Until recently, GOG would not have shown you the game and its store page, so you wouldn't have been able to try and put it in your cart - but recently they changed that. Now we can see the titles, but are unable to put them in our carts, resp. to check out with them.