'Mapsource version' is a bit misleading now i suppose. I try to use the term 'PC version' or 'PC Install' instead being as MapSource the program is now very outdated, unsupported by Garmin and can cause possible serious image compilation errors resulting in navigating problems, freezing of the device or worse [but rarely] even bricking it. Having any 'unofficial' map on an SD card is best anyway, because if it causes problems you can just take the card out and the unit will usually again work properly.

Best practice is to use only BaseCamp/MapInstall to create any land map *.img file. Safer to use the latest available map data especially when in unfamiliar territory imo. For a tutorial, look to [Only registered and activated users can see links. ] and scroll down to 'Have you downloaded a PC map version (.exe) for Basecamp/Mapsource?' and 'Have you downloaded a Gmap folder ?'. BaseCamp has an initial pop-up video tutorial as part of the program and very good on-board help.