I've just checked now and it's now in my library, I've over writed it and it works! I just have to start over unfortunately but it's not hard. Thanks for your help :)
I have the game installed and am trying to find the new update. It says I don't own the game and basically have to purchase it again, i've went into games i own and nothings there. I must've bought it without a login. I don't want to repurchase the game to update it.
