The download should most definitely not be an executable—it should bring up the Dream Maker IDE with the Your First World project files loaded up. It might bring up an executable in the event you don't already have the BYOND platform installed, though I've never tested this.
If all else fails, you can click the [Zip] link to download a zip file containing the project's files, then simply open YourFirstWorld.dme to begin the demonstration.
The download should most definitely not be an executable—it should bring up the Dream Maker IDE with the Your First World project files loaded up. It might bring up an executable in the event you don't already have the BYOND platform installed, though I've never tested this.
If all else fails, you can click the [Zip] link to download a zip file containing the project's files, then simply open YourFirstWorld.dme to begin the demonstration.