Hi,
By clicking on link provided I got Error 404: Not Found.
From Your description I'm not sure, but it seems that program is located on SD card.
If it is, try to download any of Windows CE versions that supports device's resolution, put it on SD card and rename iGO.exe (or Primo.exe) to MobileNavigator.exe.
Look original folder structure on SD card, and create same on new one.
If device is compatible with program, and most of them are, it should work.
If there are other folders and files on original that don't belong to navigation, just copy them to SD card.