Super Monday Night Combat not downloading

Check your library........

Restart your steam and it will appear in your library.

Maybe check your inventory, and activate the gift, that could have happened.

There was a Update, it downloaded some files here, it may be that, delet the game and download it again, maybe it work

Mhhhhh you should contact support then, consult the forums about it, maybe its a specific game problem.

Did he send it to your email? If so, maybe he sent it to you but then sent it to somebody else so the other person has it and not you.