You don't need to "install" these into a system folder; instead, you route Logic's metronome track to play your downloaded sample. Logic hides the metronome channel strip by default. Sick of Logic Metronome? Use The Sounds You Like!
While there isn't a single official Apple repository for a " Logic Pro X Go to product viewer dialog for this item. logic pro x metronome sound download
If you want to use a specific sample (like a wooden block, a cowbell, or a classic mechanical tick), you can download royalty-free WAV or MP3 files from these sources: You don't need to "install" these into a