Garmin Express Windows 6.21.0.0 does not recognize device is disconnected wants to update map version already installed.

Garmin Express Windows wants to update a map already installed on my Edge Explore. It downloads the map, but indicates that the instalaation failed. After I disconnect the device, Garmin Express still indicates the device is connected and searches for updates. 

I assume that Garmin Express is the problem. Any solutions?