Since 10.2.5 is old, macOS Mojave/High Sierra might say it is from an "unidentified developer." To fix this:
(You can use these search terms if you want to look up official sources or compatibility info.) imovie 1025 download exclusive dmg
: Open the App Store on your Mac, search for "iMovie," and click cloud icon to install the version compatible with your current macOS. Previous Purchases Since 10
For users running older Mac Pros, MacBooks from 2009–2012, or Hackintosh systems, iMovie 10.2.5 represents a sweet spot: modern enough to handle HD/4K, but lightweight enough not to choke older hardware. Since 10.2.5 is old