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Are you trying to perform a (like converting a file or recording your screen) that you used to do with QuickTime Pro? QuickTime Pro 7 - Technical Specifications - Apple Support

If you previously purchased a license and need to re-activate it on an older system: buy quicktime pro

Ensure you have installed (it is separate from the modern QuickTime Player). Are you trying to perform a (like converting

A modern media player designed specifically for macOS that supports high-resolution video and native Apple Silicon. If You Already Own a Key buy quicktime pro

If you are looking for the features that QuickTime Pro once provided—such as video editing, file conversion, and full-screen playback—modern alternatives are now standard. Where to Find Pro Features Today

Go to the section under the Help or Player menu.