Sooooo, following Flex's pointer, I started hunting around Help.
And....drum roll....I've discovered the answer! Me, the greatest sayer of "use the help files", now finds the reference to doing just what I want.
It is simply under Project and is an area described as "Convert projects". In my case there is a Convert project to V130-33!! Duhh! I am such a dumbo! There is also a convert project to colour.
This is a classic case of having used Visilogic for so long and completely missing a really useful bit. I get really annoyed with myself when I discover something that's been there all along but I haven't really noticed. It is almost as if the brain simply glides over the words and doesn't see them!
You can all kick me now! 🤣