Amnesia claims it needs a disk

[Kreekakon]

I understand to download a torrent when the game would be steam exclusive. But Amnesia is DRM-free and not connected to Steam, so you should buy the game via official store.

Otherwise you will not get any support here!

What he means is that he bought Amnesia from the Humble Indie Bundle for 0.95 US$, which while can get you the game DRM free, you do not get Steam keys to go with it. So his copy is strictly speaking still an official one.

If you already knew that, and I'm misunderstanding you right now then I apologize.