1. Go and download updated version of Handbrake here: https://handbrake.fr/downloads.php
2. When prompted to remove the older version click "OK" then run the installer.
3. Open Handbrake after it is finished installing
4. Click the "Presets" tab
5. Click "Save New Preset"
6. Name the preset
7. Click selection behavior for Audio
8. Set Bitrate to 256 and Sample Rate to 48, then click "Apply"
9. Save preset
10. Click presets tab in top right, then click "Set current as default" so Handbrake will open with the preset