Locate the most recent log file involving "iMovie" or "diskimageserializer".
iMovie 10.3.3 was released for older versions of macOS (typically Monterey/Big Sur era). Ensure your current OS version supports it [22, 29]. imovie 1033 dmg verified
Approximately 3.2 GB to 3.4 GB. Anything smaller is a fake. Locate the most recent log file involving "iMovie"
codesign -dvvv /Volumes/iMovie/iMovie.app imovie 1033 dmg verified
If your current macOS is older than the latest iMovie requirement (currently macOS 15.6+), a prompt will appear asking if you want to download the last compatible version for your system. Apple Support Community How to Verify a DMG File If you have already acquired an iMovie_10.3.3.dmg