A missing file - Desura

[saiyan]

I rarely buy PC games so excuse me if the answer is obvious. I've been looking around and can't find a answer. I see people list the specs so I have Windows 7 Home Premium. 64-bit OS.

I bought the game through Desura. I had to download Desura first, then I started downloading AAMFP about an hour ago and when it was finished, I clicked on launch game but a window popped up saying "The program can't start because MSVCP100.dll is missing from your computer. Try reinstalling the program to fix this problem."

When it says to reinstall, I have to reinstall Desura and Amnesia? Couldn't I just download that one file that's missing? I'm not sure why it wouldn't download that file to begin with though.

Any help would be really appreciated.