Make sure you're downloading the correct version, here's a direct link: https://github.com/CatxFish/obs-vir...nload/2.0.4/OBS-VirtualCam2.0.4-Installer.exe
You should be able to remove old versions from the Windows settings apps control panel.
OK... here goes nothin...
I'm on a version that's been upgraded all the way from Classic. They may have changed the default install location away from the (x86) directory in the last seven years. :) It SHOULD be fine, I think. The same subdirectory tree should apply, past that.