Alfa has not released a driver package for Alfa AWUS036NHA (Atheros AR9271 chipset) beyond Windows 7.
However it has come to our attention that AWUS036NHA can be stable on Windows 8, 10, and 11 using this third party driver. This driver was made for a different brand product which uses the same AR9271 chipset. Note that after installing, the device will appear in Device Manager as "TP-LINK Wireless USB Adapter" instead of Atheros or Alfa. This is because TP-Link is associated with Microsoft as the Device Developer ID of this driver package.
We have tested the driver extensively and it appears to work with the Alfa AWUS036NHA well. However it should be considered a beta driver until further notice.
Military and First Responder 
Thank you very much, with this driver the Alfa AWUS036NHA finally works on Windows 10
It seems Microsoft or somebody included a driver if you install windows 10 Oct 1803 update… my alfa NHA was detected no problem after fresh install…. plug and play… I have screenshots if needed
It works!!!
I had to run it in compatibility mode, fyi
This driver does ***NOT*** work on Windows 10 1607. I ran the exe and the adapter doesnt show up in the list. Only my internal WLAN adapter is shown.