Don't worry, we're here for you. Please contact us at firstname.lastname@example.org and let us know:
- where did you download demo package from (our website, Game Jolt etc.),
- which OS you're running (don't forget version name or number), and
- whether you got any system error messages.
We've had very few cases like that so far, so we can't really identify any recurring problems. Nevertheless, we'll do our best to help.