All you need is a sd card or an usb-stick:
- Copy the file 'GarminDevice.xml' from the Zumo XT (found in the folder /Garmin/) to the sd card or the usb-stick in a folder 'Garmin'
Disconnect the Garmin Zumo XT
Open the file on the sd card or the usb-stick with an editor and search for the entry '<Name>PreProgrammedNamedMaps</Name>' - should be around line 140
Delete the part 'Named' of the file, should be '<Name>PreProgrammedMaps</Name>' now
Save the file
Safely pull the sd card or the usb-stick and connect it again
Start Garmin Express, should now show the Garmin Zumo XT as 'connected'
Click on the Zumo XT
Click on 'Map details'
Click on 'Map options' of the City Navigator Maps
There should be an option to 'Install Maps on the Computer'
This is not(!) my finding - the user 'mario_b' in the german 'Naviboard' has found this 'hack' with a lot of 'trial-and-error' steps, all kudos for finding this goes to him! I'm posting this solution for our 'cant-install-maps' problem with his permission!
If you understand german - here's the original thread at 'NaviBoard' - https://www.naviboard.de/thread/66134-k ... post531835