Can someone please provide some difinitive clarification on some basic upgrade installation questions: 1. Is it nessassary or preferable to first uninstall the previous version before installing the upgrade? 2. If it is nessassary or prefered, why? 3. If it is nessassary or prefered, what will happen to the existing VM? 4. If it is nessassary or prefered, will the existing VM retain all the preference characteristics when last accessed? 5. Where are the VM files typically stored in OS X? 6. Are there multiple locations for the VM files in OS X?