If you have an M1 or M2 Mac (Apple Silicon), version 10.2.5 will not run at all because it lacks native ARM code and the Rosetta 2 translation layer does not support the legacy graphics framework that 10.2.5 uses.
If you absolutely need the DMG, reach out to Apple Support directly. Explain that you need the installer for legacy hardware. In many cases, support agents have been known to provide direct download links for older deprecated versions upon verification of your Apple ID purchase history. Imovie 10.2.5 Download Dmg
If you're a Mac user looking for a free video editing software, iMovie 10.2.5 is an excellent choice. However, if you're looking for more advanced features or greater control over audio and video, you may want to consider a more professional video editing software, such as Final Cut Pro or Adobe Premiere Pro. If you have an M1 or M2 Mac (Apple Silicon), version 10