Since there is rarely a "setup.exe" or ".pkg" installer for these generic adapters on Mac, follow these steps to force macOS to use the HK-808. Disable Internal Bluetooth
Try a different USB port or a powered USB hub. Some adapters require more power than a standard keyboard USB port provides. Hk-808 Bluetooth Usb Adapter Driver For Mac
There is no "official" HK-808 website. These are mass-produced units. If your package came with a small CD, those drivers are almost exclusively for Windows XP/7/8/10. For Mac, you are dependent on the framework. If your Mac is fully updated and the Terminal command above doesn't work, the chipset in your specific HK-808 may not be compatible with your version of macOS. Final Verdict Since there is rarely a "setup
USB 3.0 ports can sometimes cause interference with 2.4GHz Bluetooth signals. Use a short USB extension cable to move the HK-808 away from the computer's body. There is no "official" HK-808 website