TheEvilAlex: Sorry but I don't get it...
Do you mean to tell me that by paying €44.99 I am paying the just amount for the Witcher 2??
Because in the FAQ it says:
"Due to licensing and legal reasons the price of The Witcher 2 Digital Premium Edition in the European Union was set at 49.99 euros.
The preorder price, being 10% less than that, is 44.99. Due to the favorable euro exchange, that means that EU customers are paying roughly $16 USD more than customers in the rest of the world, which just didn't seem fair to us. We're always trying to get the best value for money to our users, so to compensate our EU customers for the price difference between European Union and the rest of the world, we'll be giving all EU customers a $16 USD credit to spend on anything at GOG.com."
They're saying that if you want to don the Soul of the Weasel and not pay the EU price, you can change your account to say you're from USA (dubious!). I paid the EU price and received the $16 compensation in the Witcher 2 confirmation email in the form of a $5.99 and a $9.99 coupon. In the confirmation email, there was also a link through which I could decide which bonus RPG I wanted and I chose that Divine Divinity thing by clicking the its picture thing.
/edit: To answer the original question more clearly: In the confirmation email after purchase.