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If you encounter this error after verification, it usually means you are trying to run the app from within the DMG window rather than your Applications folder. Ensure you dragged the app icon out of the installer window and into the Applications folder before launching.

Open the app, go to the top menu, click iMovie > About iMovie , and confirm it reads Version 10.3.3 [30]. 3. Alternative: Downloading Older Versions via App Store

You have a 2012 MacBook Pro that runs perfectly. It cannot be updated beyond macOS Catalina. The App Store tells you, “iMovie requires macOS 11.0 or later.” You cannot download the current version. Your only hope is to find iMovie 10.3.3 via a DMG.