Quicktime Pro 7

So - I can't seem to find a comprehensive answer or solution to this - and I have looked everywhere. I realize that for some horrible reason Apple doesn't support QT7 any more - I really don't know why they made such a decision but my problem is - i paid for QT7 Pro. I have it on my old MBP and I bought a new MBP this year - but can't get any of the QT7 Pro features. I have QT7 running but all the pro features are greyed out. I don't have a clue what my reg number was - searching emails doesn't find it. The QTPro still on my 2011 MBP doesn't display it. What are my options? Do I have any options?

Failing that - are there any other apps out there that will Slow video down smoothly, modify pitch (again, without quant errors or time stretch warble) AND provide a loop function for a selected section? For a guitarist QT7Pro was simply awesome. I can't seem to find a suitable substitute. I appreciate any good ideas someone might have here.

Thanks