10.3.3 | Imovie

Improved reliability and speed, particularly for Apple Silicon (M1/M2/M3/M4) Macs. Downloaded imovie10.3.3 - Apple Support Community

“iMovie 10.3.3 is the last truly stable version for Catalina without the interface changes that came in later updates. If you don’t need new features, stay on 10.3.3.” — Mac Video Editors Forum Imovie 10.3.3

: To export vertical videos (9:16) without black bars in this version, you must often use a workaround such as rotating the clip 90 degrees before export and then rotating it back in QuickTime Player . Improved reliability and speed