I love this game! But your app won't allow me to update, it even said it was able to be updated but all it said was "Play" There is now a chance I can loose everything but I can't update!!

I love the game it's just that i can't get it on my device so i used this app to play it but now it's saying it needs a update and I can't update it

I have been playing this game for a very long time, but now it tells me to go to update the game, how can I update it in this app??