I have the same problem. I bought the game with Humble Bundle (I bought the bundle mainly for SMB).Downloaded and installed it ,but when i try to start it ,it gives me :
This aplication has requested the Runtime to terminate it in unusual way.Please connect the aplication support team for more information.
I would be really grateful if someone help me and other users who have the same problem.
PS: I can send DxDiag on pm if someone can help me out.