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Go to Device Manager on your PC and make sure AVerMedia ExtremeCap UAC is listed under Imaging devices and Sound, video and game controllers.
*In some rare cases, your ExtremeCap UAC might be detected as a question mark (?) or a USB audio device. If that happens, right-click the device name and select Uninstall, and then reconnect the USB cable.
Note: after Windows 10-1709 update BU110 Extreme Cap UVC will be listed in Device Manager under “Cameras” instead of Imaging devices.