Look under the section for any Bluetooth or Realtek listings.
Because the BT118 is mass-produced with varying internal chipsets, finding the exact driver for your specific revision can be challenging. This is precisely why the search term is so common. bt118 wireless dongle driver upd
Disclaimer: Driver installation should be done carefully to avoid system instability. Always ensure you have a backup of your system. Look under the section for any Bluetooth or Realtek listings