I have two Garmin directories:
C:\Garmin
C:\Programdata\GARMIN\Maps
The SA Topo Rec 2011.gmap (Topo map in this case) has to be copied into the latter directory (mine was empty) and unlocked by copying the unlock_mapset.exe file (download on page 1) into the SA Topo Rec 2011.gmap directory and running it. The map will now show up when you open Mapsource.
From there you can transfer it to the GPS.
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