I run the Telltale Store-Version of GotG and had trouble downloading Episode 2. Even the support wasn't very helpful, only providing the default Copy&Paste-Answers like "reinstall the game", "ensure that there is no Antivir / Firewall running" etc.
After checking around here on Telltale.com, I stumbled upon the FAQ in the support area, that still shows that Episode 2 hasn't even been released on the Telltale Store:
Telltale Store - PC: Available Now!
Telltale Store - Mac: Coming Soon
Steam - PC: Available Now!
Steam - Mac: Available Now!
GOG - PC: Coming Soon
GOG - Mac: Coming Soon
Windows 10 App Store: Available Now!
And I was wondering: What is going on? How can a.) the support not know that the Episode hasn't been released on that platform yet and b.) how can Telltale be unable to release a crucial part of their own game ON THEIR OWN STORE?!