If possible, consider upgrading your Mac to a newer version of macOS. Check if your Mac model supports a newer OS, which would then allow you to install the latest iMovie directly from the App Store. Upgrading also brings security updates and new features to your entire system.
Beyond Cinematic mode, version 10.3 and its subsequent updates like 10.3.3 were also optimized for Apple's revolutionary M1 chips. They brought significant performance and efficiency improvements for Macs running on the M1 Pro and M1 Max chips, ensuring a smooth and responsive editing experience. imovie 10.3.3 dmg
If you run macOS Big Sur (11.0) or newer, version 10.3.3 will likely fail to open. Apple’s 2020 security protocols broke many older DMG installers. If possible, consider upgrading your Mac to a