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Helpful answers
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Feb 3, 2016 2:39 AM in response to mrhallbcby GeeD,The easiest is to use Migration Assistant to transfer data from your old startup drive to your new Mac? See: Move your content to a new Mac - Apple Support
Your old iMovie 9 folders should be automatically transferred and you may be able to launch iMovie 9 (I'm not sure about this since iMovie 9 does not work well under El Capitan). Otherwise launching iMovie 10 should result in an offer to update the iMovie 9 folders.
If you don't or can't use Migration Assistant then you have to find the iMovie Projects and iMovie Events folders on the old startup drive. You will find them under Users / <your name> /Movies.
Copy them both into the Movies folder on your new computer's drive and launch iMovie (10). It should see the folders and ask if you want to update them.
This should work OK if your clips were originally imported directly from a camera, camera memory card or from files you put on the computer with the finder.
If you used content from other application libraries like iTunes or iPhoto, the originals will not be in the iMovie 9 folders but in these application libraries and will show as missing in your new iMovie library. It is possible to transfer and update iTunes and iPhoto libraries from the old machine but I would doubt whether the links to the clips from the new iMovie library to your clips would still work.
Geoff.