(EDIT March 24, 2021, we have a NEW UPDATE about Big Sur. Click Here to read this information that is newer than what is posted below).
If you already own an ALFA 802.11ac USB WiFi booster and have followed our steps to get it to work on Mac OS 10.15 Catalina, you may be wondering if you upgrade to Big Sur (released by Apple today, November 12th), if your product will still work after the update. Operating system upgrades can often times break hardware.
The good news is we have tested it today and can confirm with the 11.0.1 release the ALFA AWUS036AC and AWUS036ACH still work well.
We have not yet confirmed if you can do a new install the same way you can on Catalina. So if you do not yet own an ALFA AWUS036ACH and are looking to get one and install it on Big Sur, we have not yet confirmed the installer will work. We should have an update on that in the next few days and will post to our blog.
Military and First Responder 
I just bought an Alfa AWUS1900 USB adapter. It keeps showing that The Installation Fail when installing the driver to my Macbook Pro with the macOS Big Sur 11.0.1.
Can you give me advice how to install the driver please?
Thank you
Hello,
I have a fresh install of Mac OS BIG SURE, however AWUS036AC is not running at all.
Latest available software on ALPHA.com.tw have been developed for Mac OS 10.15 :(
Don’t hesitate to add further comments on how you did to install/re-install AWUS036AC driver.
Fil