My friend and I have been playing a lot of Warframe lately, and we enjoy it a lot. But recently, it has been unable to be played. He tells me that when he tries to play it it says (and I quote from him): "MISSING UPDATE FILE". He has un-installed the game (delete local content) and re-installed it multiple times. How can he fix it?
NOTE: He says he can run Assassin's Creed 4 on his computer smoothly, and the same problem has prevented him from playing Team Fortress 2.