I am returning [thankfully] to AVID after many years in exile on FCP. I had MC5.5 on my computer and had the upgrade to 6.0 which I tried to install today. But of course I didn't read the directions and so installed 6.0 over 5.5 without uninstalling [or de-authorizing] 5.5. So now none of my licensing information is recognized. What are my options?