I am thinking about sidegrading from Vue 5 Esprit to Vue 5 Infinate before the free upgrade to 6 expires. Do I need to have my Vue 5 Esprit disk and or Serial Number to install Vue 5 Infinate Side grade? I was thinking maybe I could Ebay the Esprit package and license to recover some costs after I recieve the Infinate package. How do the sidegrades or upgrades physically work? Thanks in advance.