Someone else had the same error, and I solved it by changing the permissions of their antivirus. That solution could serve you.
warriorlink5000: So I can download it just fine, but when I try to move it into the game file folder it just disappears. I allowed both the game files and that specific file through my anti virus and the same thing still happens. Any idea what could be happening?
Edit: Turns out I'm dumb and had two different anti virus programs installed. I uninstalled one and set the permissions on the other. After that I redownloaded the game entirely. This time the missing file was there and the game launched.