shishikyuu: just tried the same and it doesn't work for me, either. seems like you can't do it with the 2nd game :(
seems like I can buy witcher 2 for just 2.84 though, and having it saves me an extra 5%, or 3 euros. so... buying it again saves me 16 cents. hehe
A few days ago, it said I got 15% off for The Witcher 3, I think 10% was for preordering and 5% was for owning the Witcher 1, now it's saying I only get 10% off, what's up with that?
EDIT: Never mind, I just went on GOG Galaxy and it says 15% again, odd.
Man, I'm playing The Witcher 1 right now, I'm a few hours into Chapter IV, I want to finish this AND The Witcher 2 before TW3, think I can do it?