Downloading fix steps
I had all the downloading issues, too. I have an iPhone 6 with iOS 9 and these steps corrected the problem:
How to fix connectivity issues on ipad/iphone:
1. Go to your settings menu and set Auto-Lock to "Never"
2. Download Hotspot Shield VPN on App Store
3. Run Hotspot and follow the instructions
4. Enter your game and download the episodes. NOTE: Do not perform background download, otherwise it wont work
Good luck!
AFM BC71 about
Back to the Future: The Game