First of all grab the app from the setup guide here: https://www.nvidia.com/en-us/geforce/guides/nvidia-rtx-voice-setup-guide/#Setup-guides
Install the latest version of your GPU driver.
Try to install the app, it will say you can’t and just close it.
Open in admin mode the file C:\temp\NVRTXVoice\NvAFX\RTXVoice.nvi with a text editor and remove the “constraints” section that looks like this:
with that section deleted save the file and execute the installer here: C:\temp\NVRTXVoice\setup.exe
Setup: you tick the input device box when the app opens and close it.
This app create another hardware audio input device so you simply go into your windows sound settings and check your RTX audio device is set as default.
once done you can simply set your mic settings in OW how you like and play!
10 series and 16 series cards seem to work fine, older cards may have issues.
Source and Credit goes to this poster here:
https://forums.guru3d.com/threads/nvidia-rtx-voice-works-without-rtx-gpu-heres-how.431781/