EDIT: So, it doesn't feel good to be this bad at making sure the game works. We're aware of the scenario file problem, and we're putting up a working file.
Looks like we needed to address a fatal error in the demo build! You may have run into a hang if you started to play through Scenario 1. This was the result of the radio system and the cutscene system not playing well together.
We addressed it, though, and if you re-download (note: the build number should be 2595, not 2546), you shouldn't run into that error again. Sorry for the inconvenience!
- John
Edit: if you don't see the download in the system, you can get it at Modestarcade.com.