There is no official driver from the manufacturer. None. Nada. If you go to their website, you’ll find a dusty ZIP file from 2015 meant for Windows 7.
The Great HK-808 Hunt: Bringing Bluetooth to Your Old Mac (Without Losing Your Mind) Hk-808 Bluetooth Usb Adapter Driver For Mac
HK-808 Bluetooth USB Adapter Driver for Mac There is no official driver from the manufacturer