Most official download pages only list drivers up to 2017 for older OS versions. KYE Systems How to Install on Windows 10 (64-bit)
Here is the first hard truth:
(if present), select Properties , go to the Compatibility tab, and set it to Windows 7 or Vista . Run as Administrator .
Enthusiasts have taken the official C-Media reference driver (version 8.2.15.0 or newer) and modified it to force-enable 5.1 output on the Value 51 under Windows 10 64-bit. This is the most users refer to.
Run dxdiag (DirectX Diagnostic Tool) to confirm hardware acceleration is enabled for the device.