: iMovie 10.2.5 specifically addressed a common frustration where video frames would sometimes appear out of order during export [9]. System Demands
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If you own a Mac that cannot run iMovie 10.3 or later (i.e., any Mac stuck on Catalina or older), tracking down a clean, verified copy of iMovie 10.2.5 is your best path to professional-quality video editing without monthly subscriptions or steep learning curves. : iMovie 10
Practical recommendations
This is a common security gatekeeper error on macOS. You can usually bypass it by doing the following: tracking down a clean