Its a bit different for me, I had Vue 6 Infinite, then made the mistake of going to 7 Complete. So I keep 6 Infinite to run Python scripts or baking etc

If however I did have the older versions I would probably keep them on my system so in case I needed to re-render something, as version changes can in a lot of cases change what the rendered image looks like

Jon

DA Portfolio - http://jonj1611.daportfolio.com/