Quicktime pro registration

You cannot anymore. Apple stopped selling Quicktime 7 Por codes in 2016.

The current Quicktime X app built in to recent macOS versions includes many of the Pro features found in Quicktime 7.

Quicktime 7 Pro will no longer run in macOS Catalina being a 32 bit application.

Nowhere. Apple stopped selling them.

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It's preloaded in Mac OS X 10.6 and newer, but not available for Windows.

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If its not on your dock, then look for it in the Applications folder in Finder. Its big grey Q icon.

You can also use Spotlight (magnifying glass on the menu bar) or Siri (colored circle on the menu bar) to find it

Open the QuickTime Player from the Applications folder or the Dock.

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See here: https://www.jeffgeerling.com/blogs/jeff-geerling/grab-single-frame-video