Furthermore, the chipset inside the C100s (the CM108) is a standard USB audio chip. The best driver for this on Windows 10 is actually the , which is a generic USB audio driver included with Windows.
pnputil /add-driver C:\Path\To\usbaudio.inf pnputil /install-device "USB\VID_045E&PID_07XX" (Replace with actual C100s hardware ID found in Device Manager) Polycom Communicator C100s Windows 10 Driver