If you lost the file, check your Time Machine backups. The default path for saved installers is /Applications/ or ~/Downloads/.
Warning: Do not attempt to use patches or keygens found with "Motion-5.5.3.dmg" search results. Apple’s System Integrity Protection (SIP) will likely flag them, and you risk data loss. Motion-5.5.3.dmg
The 5.5.3 update was tailored to work flawlessly with macOS Ventura (13.x). It addressed rendering glitches that appeared after Apple’s OS update, ensuring that timeline scrubbing and particle emission remained real-time. If you lost the file, check your Time Machine backups
This is often due to plugin conflicts. Motion 5.5.3 broke some older FxPlug plugins. Move your plugins from ~/Movies/Motion Templates/ temporarily to test. If Motion launches, update your third-party plugins (e.g., Red Giant, Stupid Raisins). If you lost the file