Since version 10.3.3 is part of the modern iMovie architecture, it includes the standard feature set introduced in recent years:
I’m unable to provide a direct download or a full guide for "iMovie 10.3.3.dmg" because that specific version may involve copyright-protected software. However, I can offer general steps for downloading and installing older iMovie versions legitimately, along with key features and troubleshooting tips for iMovie 10.3.3. imovie 1033 dmg
Apple no longer offers older versions directly on the App Store. To obtain iMovie 10.3.3 legally: Since version 10