Ok, so installed on another computer running Windows7 Professional (same version), and the installer works on the other computer?!
Anyway, I am up and running emteria now, and I am impressed!
Smooth user experience, and it works without any problem on my 15" 4:3 TFT with a HDMI->VGA adapter.
Only during setup I needed to use a native HDMI monitor.
Running on a RPI 3b+