I must re install the game

Hi,

(French guy trying to write english... Sorry !)

I have to reinstall the entire client for the second time in 2 weeks.
I've played today, closed the game and when i tried to launch it, it has disapeared from my steam interface.

I've tried to re associate the folder to the steam client... no change
I've tried to launch it from the shortcut ... idem
I've tried to launch it from the folder... idem

So i download it again.

Does anyone got any tips for this to stop ?

if my config is needed i can post it by Everest

TY for your help