nVidia ended support for the 3D Vision system on April 11, 2019. I didn’t learn this until I updated to a newer driver today, which then sent me on a long journey trying to figure out how to install a driver newer than I had before but old enough to still have 3D Vision support.
According to the release notes of recent nVidia drivers, “those looking to utilize 3D Vision can remain on a Release 418 driver,” but the 418 driver is not available through nVidia’s driver search tool.
You can still obtain version 418 from guru3d.com, along with a tool you may need to wipe any newer versions of the driver from your system:
Windows 10 may automatically update the driver next time it checks for updates. To prevent it from doing this use the “show or hide update” troubleshooter: