Where do I use the Coupon Code anyway?
 

So I pre-ordered Monkey Island and I got an activation code for it, unlocked it, beat it, and now I want to use my unlock code of Strong Bad Episode 3. But I don't know where to use it exactly.

If I try to input the code at serial unlock or manual unlock (I've downloaded the demo by the way) on the demo page it says the unlock process was unsuccessful. Am I not putting the code in at the right place? Should I download the demo again and retry? Should I delete the demo and download it again then retry to enter the code? Or did I get a bad code?

Edit: I figured it out. I had to use it in the store, not in the game. Stupid me.