Unless you already own the adapter and like tinkering, buying this specifically for Windows 10 is a poor choice. For $10–15, you can get a modern USB Wi-Fi adapter with official Windows 10/11 drivers, 5 GHz support, and better stability (e.g., TP-Link, Panda, Netgear).
Rating for Windows 10 usability: ⭐⭐ (2/5) – Works only with manual driver installation and has reliability issues. sony usb wireless lan adapter uwabr100 driver windows 10 upd
A: Your router may be broadcasting only 5 GHz. The UWA-BR100 is 2.4 GHz only. Enable 2.4 GHz on your router or connect to a dual-band SSID. Unless you already own the adapter and like
Result: Works in basic 2.4 GHz b/g/n mode. No 5 GHz support. WPA2 works. Occasional disconnects after sleep. 5 GHz support