For AWUS036ACH, download the RTL8812AU driver from the official Realtek site or Alfa’s download page.
Another Wi-Fi driver or virtual adapter is conflicting. wireless usb adapter alfa driver download
This means that is a bit of a misnomer. You are actually downloading a generic Realtek driver that has been tested for compatibility with Alfa hardware. Because chipset drivers evolve faster than Alfa’s official website updates, you might find that a driver from Realtek or a community GitHub repository works better than the one on Alfa’s official CD. For AWUS036ACH, download the RTL8812AU driver from the