Currently Being ModeratedMar 22, 2013 12:00 PM (in response to Evensong1)
Make sure you go to the "Mac App Store", not the "iTunes App Store".
It is an application that you launch from the Apple menu. Then click on "Updates" and all your purchased apps that have updates available are listed there.
Hope that helps
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Currently Being ModeratedMar 23, 2013 4:03 AM (in response to Edgar)
When downloading Additional Content, and you get that message, it means you already have the additoinal content. Verify this by going to the Media Browser (right side of tool bar), into the Sound browser, do you see FCP sound effects in there?