Have your try to extrac new file from zip or delete the game (make sure copy the file save to lol)
Well, the only thing i've did it's each update is that I delete the folder of the old version and create a new one containing the new version of the game. My saves don't disapear but I don't know where it save... maybe it's AppData or something like that
EDIT : After 30min i've tested to move my saves and test something but in the end the error still comeback.