I had entered the Registration code to upgrade Quicktime 7 to Quicktime 7 Pro precisely as instructed and did notice the "Quicktime 7 Pro" message, but it did not unlock Quicktime Pro even after restarting the program and the computer several times.

Hi jabajet,

If you see the QuickTime Pro logo, then your registration was successful. Take a look at the information below:

About QuickTime 7 Pro registration keys (codes) - Apple Support
https://support.apple.com/en-us/HT201691

To install QuickTime Player 7 on Mac OS X v10.6 and later, see Installing QuickTime Player 7.

To enter your QuickTime 7 Pro registration key into the QuickTime Player 7 application

1. In Finder choose Go > Utilities.
2. Double-click "QuickTime Player 7" to open it.
3. In QuickTime Player 7 choose QuickTime Player 7 > Registration.
4. Type your name and QuickTime 7 Pro registration key into the fields exactly as they appear in the email sent to you by the Apple Online Store. Registration keys consist of five groups of four characters separated by dashes. Use zeros (0), and not uppercase Os. Once you have entered all of the information, press the Tab key. The QuickTime logo will change to the QuickTime Pro logo, denoting that registration is complete.

Take care,

After registering, the only change is that previously greyed out options become available and functional. Start a video clip, pause it and go thru the various menus to confirm the changes.

I'm confused, do you or do you not have the pro features enabled?

The name and the icon do NOT change.

QuickTime Player and QuickTime 7 are separate and distinc applications. Only QT 7 gets updated to Pro.

The Windows version is QuickTime Player 7.

In OS X Snow Leopard and higher Apple released QuickTime X (ten). OS X allows both version to run at the same time.