1. Have you looked in "Fx Favorites> Orgainize> VST?"
2. Is the folder that the Ozone <.dll> file(s) are in selected in the 'default or alternate VST search folders? "Options> Preferences> VST Effects". And is it listed and check marked in the Avaiable VST fx list?
sorry, I do recall at the moment where the Ozone <.dll> file would be located.. aside from the root Program files. Many VSTs are installed in the Steinberg folder by default. I do not have my audio PC around either to check.
btw, @Mavericks, welcome to the Sound Forge community.