Do not run any Setup.exe files from the legacy driver—they often fail on Windows 11 due to blocked INF file installations. Instead:
To download and install the Realtek 8723DU Wireless LAN 802.11n USB NIC driver on Windows 11, follow these steps: realtek 8723du wireless lan 80211n usb nic driver windows 11
Windows 11 cuts power to USB ports to save battery, which kills your Wi-Fi. Do not run any Setup