Installed Pocket Earth first on iPad/iOS8, purchased the in-app offline maps feature. Then installed in iPhone4/iOS7 too, but now I cannot download offline maps. When I try that I get a white screen with “Premium Feature” and “Loading”, but after about 10 seconds that crashes. Now I’m a bit stuck, for I actually want the maps on the iPhone (with GPS), but I cannot even do the in-app purchase. Help?