Warframe "uninstalled" itself

[AaronGamer11]

All the files of the game are in my steam folder, but the game is greyed out, and i know that if i try to download it won't "verify existing files" it will just delete everything that is updated in my warframe and download the outdated version of the game because i ahd this issue a lot of times and it's really bothering me, my internet is like 3mb (300-380kb/ps) so i can't just download it all the time this happens like that, i just want a solution for the problem and that's all, please don't tell me to reinstall the game, i know that i will need to do that, i just want to know if the is another way to repair my game, almost forgot to say, that happened when i couldn't play because it was checking for updates forever so i closed the game, closed steam and restart my pc, when i started it again boom, the game was greyed out

[Prof.549]

The game knows better what is good for it.

Edited April 17, 2018 by Prof.549

[TotallyLagging]

Your appmanifest is most likely deleted/corrupted and Steam isn't recognizing Warframe

 

[DustyScrolls]

Same thing happened to me. I just let steam run the download it wanted to, and it worked fine from there. Hopefully it doesn't do it again tonight.