Garmin Express versions from 7.x.x.x to 7.10.0.0 in windows 10 pro 20H2 is installed without errors according to Windows 10 Event Viewer. (Notebook computer Dell XPS 15 rev 9510)
Problem is the Express window does not show up.
According to Windows task manager, only express.exe is sitting as background process. UAC virtualization for it is allowed for user.
The same versions in Widows 7 ultimate and Windows 8.1 pro function correctly.
Garmin Express versions 4.7.x in in windows 10 pro 20H2 is installed correctly, but does not communicate with Garmin servers.