copy whole gmap folder to:
(in XP - C:\Documents and Settings\All Users\Application Data\GARMIN\Maps) or
(in Vista, Windows 7/8/10 - C:\ProgramData\Garmin\Maps)
(in MAC OS
You'll have it in Basecamp Mapsource, if it's locked run in folder [Only registered and activated users can see links. ]
Btw map is very old, newer version here [Only registered and activated users can see links. ] but nobody shared PC version.