Because Windows 7 is an older operating system, many manufacturers have removed direct downloads for these drivers from their main pages, or they are hidden inside larger "SDK" or "Beta" packages.
: This site lists several versions of the driver, specifically for users with Positivo hardware (e.g., DH3BU01TV models Device Specifications Hardware IDs USB\VID_07CA&PID_A857 USB\VID_07CA&PID_0857 Latest Known Driver Version : 12.6.64.16 (Released April 2, 2015).
Recommendations:
While these drivers are designed for Windows 7, some users have successfully used them on Windows 10/11 by running the installer in Compatibility Mode or manually pointing the Device Manager to the Windows 7 for a manual installation?
The A857 chipset was designed during the transition between Windows Vista and Windows 7. Because it is a 64-bit operating system, Windows 7 requires "Signed Drivers." A standard 32-bit driver will not work and will likely result in a "Device Not Recognized" error in your Device Manager. Official Driver Details Device Name: AVerMedia A857 (Volar 700/HD) Driver Avermedia A857 Windows 7 64 Bits LINK
Restart: After the wizard finishes, restart your PC to ensure the updated driver is fully integrated.
Run as Administrator: Right-click the .exe file and select "Run as Administrator" to ensure the registry keys are written correctly. Because Windows 7 is an older operating system,
Yes, but only for specific use cases.