Fenix 6, current fw 15.20.
Connected to Garmin Express (on Windows 10)
Synced, Updated to 16.60.
Disconnect from cable, never prompted to update, even after restart.
More info after trying this multiple times:
Right after the upgrade is completed and Express tells me to disconnect, I checked the "Garmin" folder in explorer and I can see the gupdate.gcd file. However, when I disconnect the watch from USB and reconnect (after a few minutes) the file is gone.
Running the Express prompts to upgrade to 16.60 again.
Another update:
Downloaded and installed WebUpdater from: https://www8.garmin.com/support/download_details.jsp?id=931
The watch was updated to 16.60 successfully.