If you still have the original CD-ROM but lost the paper sleeve with the key, you are out of luck. Unlike modern software companies (like Adobe or Microsoft) that keep a database of your purchases, Corel has no obligation to maintain a 16-year-old database of OEM keys.
If you loved Pinnacle's workflow, you should look at (or 27, if released) or Corel VideoStudio . These are the direct descendants of Studio 12. They are paid, but they often go on sale for $40-$70 on Humble Bundle or Corel's official store. Pinnacle Studio 12 Activation Key
To activate Pinnacle Studio 12, you must enter a unique (often referred to as an activation key) during installation to verify your license. Because this software is now considered legacy ("classic"), locating or recovering this key requires specific steps depending on how you originally acquired the software. How to Find Your Activation Key If you still have the original CD-ROM but