Download a free serial terminal like Termite or PuTTY . Open the corresponding COM port with 115200 baud, 8N1. Type AT – if you get OK , your driver works perfectly.
If the manufacturer’s site is down, use the Microsoft Update Catalog: Dnub-at1-236b- Driver Download
This adapter is commonly used to add wireless capabilities to laptops or desktop PCs that lack built-in Wi-Fi or to upgrade older systems to dual-band support. Driver Compatibility and Installation Finding the correct driver for the DNUB-AT1 (236B) Download a free serial terminal like Termite or PuTTY