If the official download is hard to find:
Manually installable .cab or .inf files are available via DriverHub . 🚀 Installation Guide (Windows 7 64-bit) Driver Avermedia A857 Windows 7 64 Bits LINK
This site provides A857 Drivers for Windows 7 categorized by specific laptop OEMs like Positivo, which often used this tuner. 🛠️ Installation Tips If the official download is hard to find:
After extensive archive research (via the Wayback Machine and legacy Avermedia FTP mirrors), here is the for the Avermedia A857 driver for Windows 7 64-bit . Driver Avermedia A857 Windows 7 64 Bits LINK