Find in your purchase history and click the Download (cloud) icon.
iMovie 10.2.5 DMG Install Guide: Getting the Best Version for Your Older Mac
Mastering the process is a vital skill for anyone maintaining older Macs or needing offline access to a robust, classic video editor. While Apple has moved on to newer versions, iMovie 10.2.5 remains a reliable workhorse for High Sierra and Mojave systems.
Open the app from your Applications folder or use Spotlight (Cmd + Space) to find it. Official Alternative: The "Purchased" Method