When you download the Garmin.zip from 1tread.
There is something mismatch. Maybe the Author have forgotten to explain.
Rename the default Directory after unpack the Garmin.zip /Mobilenavigator/ > to /Garmin/
Rename Mobilenavigator.exe > to Garmin.exe
Then execute Garmin.exe, first the MortScript then the App will running.
The default Pfadname is for >Storage Card<, be shure youre Device got that Name for the SD-Card slot.
Iff you feel not fine with upcoming CeExplorer, uncommand the run command in Garmin.mscr with > # <
E.G. # Run("\Storage Card\Garmin\explorer.exe")
Not tested on real Device, only in Emu., but give them a try.