Are you attempting to install this on a specific or OS version ?
: Click the Titles and Generators button (the "T" icon) in the top-left corner or press Option-Command-1 to see all available styles. final cut pro x 10.3.4 download
Downloading specific older versions like 10.3.4 is complex because Apple primarily offers the current version (currently FCP 11.x) through the Mac App Store Are you attempting to install this on a