The ren plugins are not produced or provided by Digidesign, they are produced by Waves. I believe at one time they were included with a certain bundle of plugins with new Digidesign equipment, but the licenses are still controlled by Waves. If you need to refresh your license with them, which I'm am most certain that you will need to do to obtain the Pro Tools 7 compatible versions, you will have to contact them. Their website is
www.waves.com