The DOS compatible one is free and the Windows one isn't, (although a none saveable Windows version is) unfortunately it's a bit expensive for my budget so the DOS version is used. The DOS version comes with the required driver to run the HP plotter and works well for hobby use. There are no modern functions, such as auto-routing and schematic capture.
The drivers zip file has code for Roland plotters, included is a note that recommends using the
Roland DXY1150 for driving a HP7475A plotter.