from:
[Only registered and activated users can see links. ]

Have you downloaded a Mapsource Gmap folder ?

copy it in:
(in XP - C:\Documents and Settings\All Users\Application Data\GARMIN\Maps) or
(in Vista, Windows 7 - C:\ProgramData\Garmin\Maps)
You'll have your map in Mapsource.
To unlock use:
UnLock MapSource Directory
If it's confusing, sorry ,we cant explain it better

..It's repeated in almost 70% of Mapsource maps versions threads and in this thread in post n6