Most FMS trainers are proprietary info. I have a demo version of one on my computer at home. It works, but only if I fool my computer by changing the date....it has a timebomb built in if you try to use the program beyond the demo date. I forget if I downloaded this or got it on disk?
That said, I would wonder if a demo would be available on either the Honeywell or Collins website?
The only thing I would suggest and know for sure is why don't you download the Garmin GPS trainer software for their 430/530 series. If you can build and execute a flight plan on the Garmin, you sure will be able to work any of the FMS computers.