These devices were designed for older systems. Drivers for these OS versions are usually available on archive sites like DriverGuide or Softpedia .
Most Wifly City adapters use chipsets. Instead of searching for the "Wifly City" brand, searching for the specific Realtek driver usually works better and is safer. Wifly City Idu 2850ug 56g Driver Download203
Choose and point it to the folder you just extracted. These devices were designed for older systems