The "wrong version" Proplem

Hi, I had i proplem trying to enter the game but it allways says(file changed),So i deleted
the game and downloaded the game, but this time it says "your client is invalid version, Reinstall the latest version game client" so i tried what i could do and then i ended up here,
Sooooo........what should i do?.......btw i couldn't find any of the latest versions!