If you have the original packaging, check for ot-world.com . Unfortunately, smaller manufacturers often let their driver pages expire.
Recommend a if your signal is too weak
Select "Install Driver Only" (unless you specifically want the Ralink utility). Restart your computer. Plug in the OT-WUA600NM adapter. 📶 Troubleshooting Common Issues Adapter Not Detected 600m wireless-n mini usb adapter ot-wua600nm driver download