Hi Johannes,
Can you share a screen shot of the software and the "blank miniscope window" so I have a better idea of what you are describing?
If you download the pre compiled software from github it shouldn't require you to install anything else to get it to work.
If you are compiling the software yourself it needs opencv built for QT, Python, and numpy (and soon it will also need libusb).
Richardson, I work and compile everything in QT Creator so I'm not sure all that is needed for compiling directly in visual studio. That said, QT does use visual studio to do the compiling and I think I use msvc2017.