That’s pretty interesting. While I don’t know what MP does, the driver install should’ve been a separate dialog for QGC that is launched from the installer. I recently did some custom builds of QGC for Windows, Linux and Android and none of the testers noted any problems with the STM32 virtual com port driver install on Windows.
It would be interesting to know what blocked that driver install, or caused it to fail, on your particular Windows computer. Windows itself is 30 year old technology with a face lift, but it still should’ve worked even though those drivers are unsigned, by authorizing their install thru the dialog.
I’m not sure of the origin of that driver package in the Windows version of the ground stations, but it is a closed-source package AFAIK, and it might be out-of-date.
Good to hear you got it working anyway!