There should be some sort of 3DVIA icon in the game window if you don't have the plugins installed, click on it and it will start downloading the installer.
Install the plugins, it'll ask for you to restart (at least for me anyways) and then you should be able to play the games. You might need to enable "Simulate Modern Speed" and "Disable caching" as well if you're still struggling.
I had issues getting them to work on my PC except for one game but I was able to play them by setting up a virtual machine and doing the whole install process there on a fresh install of W10.