The other way to get files from Mapsource without this tool
1). Copy Garmindevice.xml from your Nuvi to SD Card (place in Root directory)
2).Insert Sd card into your computer and then Mapsource will detect your SD card as NUVI !!
When you want to tranfer files from MapSource .., Just choose SD Card instead NUVI.
You will see files from Mapsource be placed in SD Card.
You can try it. :-))