I quote Guitta: "If I need Vue to work with Poser 4, I will keep Vue especially for it on my HD. And if needed, I will copy /Past the entire Vue to another place on my HD, upgrade this copy to Vue 4.2 and use it with Poser 5. So I can do both" Yes, if things were all that simple, but they aren't Guitta. Trust me as a computer professional, there's more happening during an install then placing files in a single directory. For example the registry is updated, user settings, sometimes files I stored in the Windows system directories, etc, etc.