Serial Key — Agatha.christie.peril.at.end.house-vace.-pc-.-en-

I recently came across a version of Agatha Christie: Peril at End House labeled “VACE-PC-EN” and understand this may be an unofficial release. To avoid any legal or security issues, I would like to purchase a legitimate copy of the game. Could you please confirm where I can buy a licensed PC version in English?