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iMovie HD 6.5.1 latest version of iMovie to have the timeline before iMovie 08' changed it all.
iMovie-6-HD-6-5.1.zip (27.28 MiB / 28.61 MB)
Compatible with all modern versions of OS X up-to Mojave. Operating System post Mojave will no longer support 32 bit application such as this.
Emulating this? It should run fine under: QEMU