Go to http://www.apple.com/support/downloads/imovieHD6.html
When it has finished downloading it will say it can not install because there is no iMovie 08 or something. This is easy to fix.
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Then rerun the installer. It will install now, even on this old Pismo (but it does not run without the right processor).
When it has finished downloading it will say it can not install because there is no iMovie 08 or something. This is easy to fix.
[Removed]
Then rerun the installer. It will install now, even on this old Pismo (but it does not run without the right processor).