I was having a heckuva time downloading episodes 2-5 to my ipad after purchasing the multipack. Based on scouring every bit of information I could find I found a fix. Download hotspot shield, a free VPN client, from the App Store and give it a try.
Fixed all my issues.
The problem seems to be coming from the server connections between the ipad and telltale. Hopefully a permanent fix is in they works, but give this a try.