Using the Windows version of QuickTime 7 is highly discouraged by security experts because Apple stopped providing security updates for it in 2016.
If you previously purchased a license and need to re-activate it on an older system: buy quicktime pro
Enter your name and the 20-digit registration code exactly as they appeared in your original confirmation email. Using the Windows version of QuickTime 7 is
Ensure you have installed (it is separate from the modern QuickTime Player). buy quicktime pro