Desktop sound through OBS (ZOOM)

[GrantsVoice.com]

I was able to figure out how to route my Desktop sound through OBS using this video...
Using NDI 4 Tools and obs-ndi-4.9.0-Windows-Installer.

BUT when I do, it KILLS my mic audio and the desktop sound is awful.
When I stream to YouTube, it does not do this, but when going to zoom/meets/others it does. Any ideas?

 

[GrantsVoice.com]

Any help here? I just reinstalled on a new PC and now the TOOLS above will not load. I've spent the last hour uninstalling and reinstalling, etc. The tools will not load.