You don't need to install the gmap folder. Simply place it correctly and BaseCamp/MapInstall will find it. The info is here: [Only registered and activated users can see links. ], scroll down to 'Have you downloaded a Gmap folder ?'. Please search before posting basic questions thanks. Everything you need is here: [Only registered and activated users can see links. ].

PS: If you really want to have the registry keys, you can add them later with [Only registered and activated users can see links. ], just click the 'MapSource' tab. The gmap folder will work fine without that though.