This is a common security gatekeeper error on macOS. You can usually bypass it by doing the following:
Apple iMovie remains one of the most accessible and powerful video editing tools for macOS users. If you are running an older Mac operating system, you may specifically need . This version bridges the gap between older macOS environments and modern video editing workflows. imovie 10.2.5 dmg
: Go to System Preferences > Security & Privacy > General . Under "Allow apps downloaded from," click Open Anyway next to the iMovie notification. "iMovie cannot be opened because of a problem" This usually indicates an OS incompatibility. This is a common security gatekeeper error on macOS