Missing File after Patch.

[Fumples]

There is no full free game.

You have probably applied the Penumbra Overture patch to Penumbra - Tech Demo. Just reinstall the game and all should work,

Penumbra Game [Free Game]

Try installing and tell me if its the free version or not, thats where i got the game. Doesn't say DEMO or TECH DEMO ANYWHERE.