users of macOS High Sierra — reboot with camera plugged in
Was working so-so on previous operating systems (never was able to save the settings) and now with High Sierra, this app is broken… but I found a WORKAROUND:
You must boot your computer with your webcam already plugged in. Then when you launch the app, it should work to adjust the settings.
GeorgeKao.com about
Logitech Camera Settings, v1.2