I have a similar problem, although I do see the game in the downloadable game list. I get the following message when I try to log in:
"Sorry, but we can't find that username. Please check and re-enter your username in order to log-in."
As the left part of the launcher window is practically empty, I have the suspicion that it can't connect to the telltale server.
Also, I don't have a "take me to the demo" button, and no "manual unlock" button either. Which means I have no means to play the game
Please help!