In order to run the software on your Windows 8 computer, right-click its icon, select Properties and navigate to the Compatibility tab. Check Run this program in compatibility mode for box, select a compatible operating system from the provided list, click Apply and then OK. If it doesn't work, you will need to upgrade the program to the latest version. Kepler 7.0 can run on Windows 95, Windows 98, Windows 2000, Windows Me, Windows XP, Windows Vista, Windows 7 and Windows 8 platforms and will cost you around $111.