[Image: http://puu.sh/72UTo.jpg]
Basically it wouldn't update so I decided to reinstall it. First weird thing I saw was that instead of downloading the installer onto the desktop like usual it created a new folder for it. Version 177R. HELP.
I had this issue and no amount of googling fixed it.
If you haven't already, you can try going to the Download Page and clicking the link beneath the green box (it says something about downloading the game the "old fashioned" way). For some reason the newer installer just doesn't like my computer, but that method solved my problem.
Hope this helps.