If you previously used a newer version of iMovie, your library file may not open in 10.1.12. You will need to create a new library or restore an older backup of your video projects. To help narrow down the installation process, tell me: What macOS version is your Mac currently running? Have you previously owned iMovie on your Apple ID account?
: Projects are stored within the "iMovie Library" package in your imovie 10.1.12 download
Compared to newer versions like iMovie 10.3, version 10.1.12 is built on an older framework. Newer versions are optimized for Apple's M1/M2/M3 chips and newer versions of macOS, and they include features like Cinematic Mode, Magic Movie, and Storyboard support. However, for users on older Macs, iMovie 10.1.12 remains a perfect match. If you previously used a newer version of
Click on your or account icon in the bottom left corner. Scroll through your Purchased history to find iMovie. Click the Download (Cloud) icon. Have you previously owned iMovie on your Apple ID account
This error occurs if you try to download iMovie from the main App Store storefront instead of your account's purchased history. The main storefront always points to the latest version of iMovie, which requires modern macOS versions. Use outlined above to bypass this check. "The application is damaged and can't be opened"