Realtek drivers not showing up after installation

I want to play music simultaneously in 2 Bluetooth speakers but for that, I need stereo mix. I have installed Realtek HD audio driver and tried 2-3 different exe versions; it installs and I have restarted my computer each time, but after restarting I can't find a driver. I have tried viewing device manager hidden drivers too but there's nothing there.

Please help me find where the drivers are!