Well, this RC Scoring Pro-software seems very nice but is no option for me.
I just organise a single FUN-competition (an endurance-buggy-challenge) and do not have a budget to pay $ 599.00 for that soft.
Hence the choice of the free software: Laps Free.

I have used Laps free manually when we didn't had a transponder system, used it via a simple USB-Serial-adaptor with the older AMBrc-20-system, and we were able to use it with the AMBrc-decoder (not the latest version) through a special USB-Serial-adaptor.
SO Laps Free functions allright. It's just that the decoder is not recognised by the pc, when connecting it through USB.
So I really would like to find a correct driver for this. There should be one, I guess, since this AMB-RC-Decoder had the USB-port (typeB)

I'll send you that PM and hope that you could find something.
thx in advance, Rc Corral!