Good news- ALFA AWUS036EAC, AWUS036AC, and AWUS036ACH (which are Realtek RTL8812AU based devices) are all compatible with Microsoft Windows 11. In most cases they will be natively supported.
If not, you can download ALFA's latest driver here to install.
See this video to see how to switch from your internal WiFi card to your ALFA device on Windows 11. In most cases the ALFA will be called "WiFi 2", but if you have had other USB WiFi adapters installed on the PC before, it may appear as WiFi 3.