I didn't get any replies so far, but solved the problem by spending the whole afternoon with Google.
What I did was the following, and maybe that helps other users as well.
1) Remove the existing VMC lite installation from your computer & check if you have anything related to your usb dongle in the Device Manager (USB part), if yes remove that too
2) Shut down, reboot
3) Download the latest VMC (full VMC) software and install
4) Shut down, reboot
5) Open VMC from your desktop, insert your dongle - it will automatically install now all drivers again
6) Device detected in the Mobile Connections (finally!!)
7) Connect & enjoy! 😃