I am not too sure, but I have sent my findings to Lacrosse, as I could not find any contact for Heavy Weather and have asked them to look at it.
The other thing is that you have to be really prepared before opening Heavy weather, but first opening Windows Task Manager and the second you see heavyweather.exe appear on the processes list, you have to make the change, or it just freezes up. if you do it immediately, it is perfect. Weird!! It's a pain though, because if you reboot, you have to do it all over again!!