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If you’re still on macOS High Sierra or Mojave, use the Purchased tab in the Mac App Store. Avoid any site offering a standalone “iMovie 10.3.3.dmg” file – those are almost always unsafe. Imovie 10.3.3 Download
– If you previously had iMovie 10.3.3 on the same Mac, restore the application from /Applications/ using Time Machine. Enhanced performance and efficiency for MacBook Pro models
: Minimum 3.5GB of available space for installation. How to Secure an iMovie 10.3.3 Download iMovie - App Store - Apple Imovie 10.3.3 Download