Hello David!
It's normal that you only see one Vienna Ensemble plugin. That's the way it should be. Installing one Vienna Ensemble version will overwrite the other - at least the plugins. I advice against making experiments with having both plugins installed. This has a high potential of becoming a big mess.
I have attached a screenshot where you can see how to add Vienna Instruments Pro with Vienna Ensemble 7 (iLok).
Best,
Andi
Vienna Symphonic Library