Yes I did the same thing, I'm geussing you used kinguin? or something like that doesn't really matter but if you activate it and change the appid file and save (just re-type the appid (10710)) as said in the instructions on such sites as kinguin then you should defiently be able to play as I am just have to use a non steam shortcut but it updates automatically and everything works great so don't worry just follow the instructions.