If you are using a Mac Pro (2008-2012), a white MacBook, or a 2011 Mac mini, you cannot run the latest macOS. Your machine caps out at OS X El Capitan or High Sierra. The file is specifically signed to run on these older systems. Modern iMovie simply refuses to install.
: Video projects take up significant space. For the "best" experience, store your iMovie Library on an external SSD to keep your internal drive fast. Quick Comparison imovie 1033 dmg best
“Does anyone have a safe site to download this specific version?” Reddit · r/MacOS · 2 years ago If you are using a Mac Pro (2008-2012),