Hi Joe,
I have been using the sw to run a P200 for about 18 months. I have found that you need to connect the cable to the ECU and computer, power up the ECU and then start the Jet Cat Software. You will then be able to use the software to run the turbine and download data.
I use windows XP and have had no issues with the software other than if you run the turbin then shut it down and let it go through the cool down cycle, it will get to about 100 C and restart the turbine.