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The Demo is actually the whole thing, except that in order to play all of it, you also need to download the unlock key that you purchased and install that. Then you can play much farther than finding Doc's journal.
http://www.myfellowgamers.com/ - All games are not created equal Omnomnomnom
"Silly people, Why would a demo be the entire episode? that kinda defeats the purpose of a demo, its about 15mins long if you dont faff around."
To the defense of the "silly people", for episodic games, it isn't unusual to give you the first episode for free as a demo. And the desciption says Episode 1, not demo of Episode 1. Maybe it also says somewhere you will only get to play the short tutorial for free, but I haven't seen that anywhere. I, too, was surprised when the demo ended right after a few minutes.
That said, I think the short demo was pointless. Unless you haven't heard of Telltale and have no access to the internet, you most likely know what kind of game this is. The demo shows you not much else, it's way too short to make up an opinion.