You will need two things:
- An existing installation of a Jazz Jackrabbit game - available from Haze's Hideout.
- OpenJazz for Windows - see the download section.
The OpenJazz files must be in the same folder as each other.
You can place them in your Jazz Jackrabbit™ folder,
and OpenJazz will be ready to run.
You can also place them elsewhere if you use your Jazz Jackrabbit™
folder as a command-line option (e.g. by dragging and dropping it onto
OpenJazz.exe).