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Express does NOT install maps from GPSMAP66SR

my GPSmap66SR has maps installed on it. (Topoactive Europe central, east and west....)
I want to install them on my computer as well but Garmin Express does NOT show that option. 
I can see and use the maps in BaseCamp but it works very slow because basecamp only uses the maps over the usb connection to my GPSmap66SR. 
Why can I not install them on my computer?