How do I download Final Cut Pro original sound effects? I lost them when I had to reinstall the my Mac OS

Maybe you are thinking of the “iLife Sound Effects”…. These are part of iMovie, and appear automatically in FCP, if iMovie is installed. So install iMovie and see if get the sound effects you were after.

Additional Content for FCP can be accessed from the FCP menu. It will appear in System Settings Software Updates.

You do it from FCP itself

Final Cut Pro->Download Additional Content…

Edit: Tom won on photo-finish 😁