Tony, Are you still getting this error?:
"On the GPS I have gone into settings then into Navigation Path and set the Navigation Path as "\SDMMC\SkyDemon\SkyDemon.exe". When I then go to the main screen of the GPS and press Navigation I get "Please set Navigation Path"."
If you are it means that you haven't "saved" your Navigation Path by tapping the disc icon at the top before exiting.
If it was a .net problem, SkyDemon.exe will at least try to run & then throw up an error message.
I've also discovered that on my unit, I have to put it into "Sleep" mode, after exiting SKD, to save any registration changes. GPS uses Com1 & 38400 baud works well.
If you are still stuck, send me a PM & I'll point you to a menu to download, which might make things easier.
I can also confirm that Tim has isolated the problem I was having, & now SkyDemon works on both my Satnavs.
Regards,
Max.