When you manually download the game files (see sticky thread http://www.telltalegames.com/forums/showthread.php?t=33233) and just put them into your
\Users\***\Documents\Telltale Games\The Walking Dead\SyncFs\Data\**episode**
folder, the game will maybe launch but immediately crash. What you have to do is to copy the files into the game folder here, too:
Program Files\Telltale Games\The Walking Dead\GameData\Pack\***episode**
If there is no episode folder in your game directory, create it, Episode 4 would be:
Program Files\Telltale Games\The Walking Dead\GameData\Pack\WalkingDead104
Simply have those files twice at both locations to be safe. It works for me.
Telltale is throwing dirt at us paying customers every time they release a new episode. Shame on you, Telltale management, I have never seen a worse combination of bad support, code and release policies. If it wasn't for Kirkmann's great storytelling and my love for the WD universe, I wouldn't lose one more second with your games.