You can buy the software here - http://www.butel.nl/products/arc5/arc5.html

Or you can download it from here - http://parnass.org/tk5/

Radio Reference supports a site which will automatically program it to your local area, from what I read. I do not belong to Radio Reference - hence I don't know anything about it.

Looks to be a real PITA to program - without a cable and software.