If you have bought an Acer desktop or laptop in the last 3 years and you cannot find new Realtek audio driver, here is what you should try:
Download Realtek audio driver and utility (actually mislabeled should be called Realtek Audio Console) from Veriton X4665G (if you have a desktop).
Download Realtek audio driver and audio console driver from Predator PT917-71 (if you have a laptop).
Run setup.exe from the driver and setup_app from the utility/console.
Run Microsoft Store to update the Realtek Audio Console.
You will no longer have the old Realtek HD Audio Manager. All audio functions will be run inside the Realtek Audio Console.