The direct download of iMovie 10.2.5 DMG from Apple's official website is no longer available, as the company has discontinued support for this version. However, I can guide you through some possible alternatives:

Some reputable websites, like Softpedia or MacUpdate, might have archives of older software versions, including iMovie 10.2.5. When using third-party sources, be cautious and ensure you're downloading from a trustworthy site to avoid malware or viruses.

In 2016, Apple released iMovie 10.2.5, a popular video editing software for Mac users. This version brought several improvements and bug fixes to the app. As a creative enthusiast, you might be looking to download this specific version for your Mac.

Always verify the integrity of the downloaded file and run virus scans to ensure your Mac's safety.