According to Apple Support , this version specifically addresses the following:
You can also verify the checksum if available, though most users should simply ensure the file opens without errors. final cut pro x 10.4.5 mac.dmg
As an older version, the .dmg (Disk Image) for 10.4.5 is often sought after by users running vintage hardware or older operating systems that cannot support the latest FCP updates [2]. System Requirements To run Final Cut Pro 10.4.5, your Mac typically needs: Operating System: macOS 10.13.6 or later. Memory: 4GB of RAM (8GB recommended for 4K editing). According to Apple Support , this version specifically
: Improved performance when generating waveforms for clips that do not contain audio channels. Compressor Stability Memory: 4GB of RAM (8GB recommended for 4K editing)
The most prominent feature in 10.4.5 was the introduction of the Workflow Extensions API, allowing third-party applications to integrate directly into the Final Cut Pro interface.
After the copy completes, eject the DMG by clicking the eject icon next to its name in Finder. You can now delete the original file to save space, or keep it as a backup.