If you have never downloaded iMovie before on your Apple ID, Method 1 will not work. In this case, you must rely on trusted Mac user groups and local backups.
Specialized legacy Mac support teams like Grand Rapids Macs host verified installer files ( .pkg ) for version 10.1.12. imovie 10.1.12 download
Launch the Mac App Store on your older Mac. If you have never downloaded iMovie before on