To download iMovie 10.1.12, you generally need to use the Mac App Store's version-matching feature, as Apple does not provide direct download links for specific older versions. This specific version is often the target for users on macOS Mojave (10.14) or those with hardware that cannot support the latest version. Recommended Method: App Store "Purchased" Tab
Conclusion
: A prompt will likely appear stating that the current version is not compatible with your OS. It should offer to download the "last compatible version" for your specific system. Apple Discussions Compatibility Notes macOS Catalina (10.15.7) : iMovie versions are known to be compatible with this OS. macOS High Sierra (10.13) imovie 10.1.12 download
OS Compatibility: iMovie 10.1.12 is the final update for macOS High Sierra [11, 14]. To download iMovie 10
If you have never downloaded iMovie before: Apple’s servers will usually give you the latest version (which won’t install on your old macOS). In this case, you may need to: Adware and browser hijackers
The search for the iMovie 10.1.12 download is a testament to Apple's "forced obsolescence" model. While Apple wants you on the latest OS and latest iMovie, the reality is that 10.1.12 is a perfectly capable, lightweight, and stable video editor for older machines.