Apple discontinued support for the Windows version in 2016 due to critical security vulnerabilities that will never be patched.
Support for legacy formats like QTVR, interactive movies, and MIDI files. Important Security Advisory QuickTime-7-Pro-Registration-Keys-Full-Version-Download
QuickTime Player 7 is incompatible with any macOS version released after macOS Mojave . Modern versions of macOS use QuickTime Player 10, which includes many former "Pro" features for free. Apple discontinued support for the Windows version in
For users on older systems (Mac OS X v10.5 or Windows Vista/7), the Pro version offered: Modern versions of macOS use QuickTime Player 10,
For a modern and secure alternative, you should use the latest QuickTime Player included with your Mac or a third-party media player like VLC.
QuickTime 7 Pro is a legacy application that is no longer supported or sold by Apple. While you might see "full version download" or "registration key" offers online, these are often associated with outdated or unsecure software distributions. Current Status of QuickTime 7 Pro