On the same page that you downloaded 0.8, there's a link to older versions of CV. Version 0.7.5 should be what you need. 0.8, the current one, is in the beta stage. There are a few bugs, and not all the functionality works. Also, the plugin that you downloaded was mainly a test for the plugin system. I hope to add more functionality to it, but I don't have the time, so that is why the source code to the plugin is available so others can write other plugins to support many games. Unfortunately, CV 0.7.5 doesn't support loading the .x files used by SFC3, so what you have to do is edit the hardpoints of the .mod file with CV 0.7.5, and then use Taldren's tools to convert the model to SFC3...kinda long way to do it, I know.