"The current version requires macOS 14.6 or later, but you can download the last compatible version." Key Changes in iMovie 10.3.3
: Users can edit video captured in Cinematic mode on iPhone 13 or later, including the ability to modify depth of field intensity and shift focus points directly in the timeline. imovie 1033 dmg new
Alex double-clicked iMovie_1033.dmg . A small window popped open showing the iMovie icon and a shortcut to the “Applications” folder. "The current version requires macOS 14