There will never more come an actual "MapSource version", because the development of program MapSource is finished more than one year ago and all original maps in gmap format come with BaseCamp/MapInstall. But it is everywhere usual to say "MapSource version" for the PC versions.
For gmap-versions is no setup program necessary, just copy to the right directory. The programs BaseCamp and MapInstall are available for free from garmin.com.