I had this exact problem with my Wireless HS80 headset. The dongle showed in the corsair app, but not the headset and the dongle would not light to show device connected (but the headset was working fine). To correct, I unplugged the dongle, turned the headset off and then wired the headset to pc (might need to use a diff usb slot) and this forced hardware rediscovery. The corsair app then installed the correct module. After that, plug in the dongle and then you should be ok.