SOMEONE HELP! MY GAME UNINSTALLED ITSELF.

[RunoMira]

So last night I installed Cod MW3 onto my Mac and even played a few matches but then in the morning I check my games and it says its uninstalled and the annoying part is I cant re install it because it says I don't have enough space but the game being downloaded is what took up the space in the first place so Im really annoyed and confused right about now.

[76561198218426745]

See Installed games are appearing as uninstalled. Steam should check the existing files before installing, but you may not be able to get that far if there is not enough free space.