I believe all software is bought and then downloaded. There is also a really good piece of free software for download to keep results of the championship. This software is fully internet compatible so it makes uploading results a lot handier too.
I really wish they'd come up with an affordable transponder system to put on mini-zs. Nobody running these things in their garages can afford an AMB system. I've seen literature on a few they use for slot cars, but not really sure how well they work. These particular systems use infared beams set at different heights across the track. The cars have a piece of tape on the antenna (all set at different heights), so when the tape interupts the beam, the car is counted.