Product Key Retrieval

I recently built a new computer and installed Windows 7 on a new hard drive. When I did this I also took the hard drive from my old computer and put it in the new one so that I wouldn’t have to move my data. When I now try to run Scrivener off my old drive it says that I am running a trial version and that I need to enter my product key within 30 days. I don’t have my product key any more. How can I make it recognize that I have a paid version?

There are instructions here about retrieving your serial number: … afterSales

That worked. Thanks!