Steam Activation

[SHODANFreeman]

Hi,

I've tried to activate Penumbra on steam using the key provided by Frictional Games (found on http://shelf.frictionalgames.com/) and i'm getting "Invalid Product Code". Why it happens???

Thanks!

That is the serial code to activate the download of Penumbra Collection, it has nothing to do with Steam. They haven't made Steam codes available for Penumbra, and as far as I know they are only doing that for Amnesia.