Some useless info taken from the Web:-
Here's a trick to getting MapSource, and it works! Best part is, it's right from Garmin with no hacks or cracks.
Download the Training Center:
http://www8.garmin.com/support/download ... jsp?id=835
Install it
Then download the MapSource update:
http://www8.garmin.com/support/download ... jsp?id=209
Install it.
You now have full blown MapSource, enjoy!