Frontech does not maintain a robust driver archive. Their official site (frontech.com) may list the JIL-1731 under "Networking" but often redirects to Realtek/ASIX downloads. If unavailable, use the chipset vendor’s drivers.
Since modern Windows versions handle drivers automatically, this guide focuses on or forcing the driver if your JIL 1731 is not working. frontech jil 1731 driver