The FV-AC1200 is often rebranded. Drivers for EDUP, BrosTrend, or Cudy AC1200 (with same chipset) also work.
Realtek drivers require a direct download. fenvi fv-ac1200 driver
The "brains" behind this hardware are almost always a chipset manufactured by Realtek (commonly the RTL8812AU or similar variants). Therefore, when you are searching for a Fenvi FV-AC1200 driver, you are essentially looking for the software package that allows Windows (or Linux) to communicate with that specific Realtek chipset. The FV-AC1200 is often rebranded