I am also one of those frustrated individuals who cannot load maps. I have a new Garmin GPSMAP64s and I have been through all this stuff for hours on end. My problem is when I click on MapsInstaller, it comes up with my device recognized, but the words "No unlocked maps were found for this device." Then the continue button is greyed out, and I just can't get the NY topo map (which is stored in a folder with dozens of ".img" files) from my computer into BaseCamp. I will pray deeply and sincerely for anyone that can help.