If you are on Windows, and Apple strongly recommend uninstalling QuickTime 7 . Because it is no longer updated, it serves as a potential entry point for malware. Most modern browsers and Windows versions now natively support the formats (like H.264 and AAC) that QuickTime once provided.
Historically, QuickTime 7 Pro was unlocked by purchasing a 20-digit registration code from Apple. Since Apple no longer sells these codes, modern "full version" downloads are typically unofficial. Key Features of the Legacy Pro Version QuickTime-7-Pro-Registration-Keys-Full-Version-Download
Ability to create H.264 video, cut/copy/paste editing, and save movies from the web (where allowed). If you are on Windows, and Apple strongly
Apple discontinued support for the Windows version in 2016 due to critical security vulnerabilities that will never be patched. If you are on Windows