In order to install System Maker 1.4 using the button below, you must first  install Win Zip which is available here. Here is a tutorial that shows you how System Maker creates an .ssc file for Celestia.
Your system must include, at least, 3 terrestrial planets 3 jovian planets   with appropriate moons An asteroid belt with at least 4 minor planets 1 outer ice planet similar to one of the larger Kuiper objects 2 comets