If your CX31993 dongle isn’t recognized, the driver is almost never the problem. Check these instead:

Bypassing Drivers for Ultimate Audio Quality (Bit-Perfect Playback)

The Conexant CX31993 is a fully USB class-compliant audio codec. It requires on any modern OS. All functionality is provided by the operating system’s native USB Audio 2.0 driver stack. Reported issues are generally related to power management or buffer handling, not missing drivers.

How to Install the Conexant CX31993 Driver on Windows 10 & 11

Given the above, you should not need to download a driver for your CX31993 dongle on a modern system. If you are trying to troubleshoot an issue where it isn't working, or if you want to be thorough, here is where you might look: