Before downloading anything, confirm that your HK-808 uses the Realtek chipset. Plug the HK-808 adapter into a USB port on your Mac.
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To make the HK-808 work on a Mac, you must either supply a third-party driver package that translates Realtek signals for macOS or use an open-source kext (kernel extension) injector. Step 1: Identify Your Specific Adapter Chipset