Motion-5.5.3.dmg Online

Released as a maintenance update, version 5.5.3 focused primarily on performance stability rather than new creative tools. Motion release notes - Apple Support

: The direct pipeline to Final Cut Pro saves hours of export and import time during tight production deadlines. Motion-5.5.3.dmg

If you receive a security warning from macOS Gatekeeper when trying to open the app, it usually means the file was downloaded from an unverified third-party source. Released as a maintenance update, version 5