A long, long time ago I bought both the Witcher 1 and The Witcher 2 enhanced editions on Steam and got codes to redeem backup copies here on GOG (that is where I've bought The Witcher 3, and most of you know why).
While playing the Witcher 1, sometimes I used the guide that came with the bonus content and I distinctly remember it was in Italian. A while ago I re-installed The Witcher 1 through Galaxy and, looking at the guide again I noticed that it is in English. I decided then to download The Witcher 1 through Steam and there the guide is in Italian.
Why is the Italian game guide for The Witcher 1 on Steam and not on GOG? Did you forget to include it?
The guide for The Witcher 2 is also available in Italian on GOG though...

Up.

Same here. I bought the game here on GOG. I would kindly ask you, CDProjekt RED guys, if you could include the Italian Manual in the downloads, please.

Maybe they just forgot. Send a ticket to support - the staff usually doesn't read the forum.