I have an old MacBook Pro running iMovie 9.0, and a newer Macbook Pro with version 10.1.1. I am trying to get them to match.
When I try to update the old one to use it for my movies by going to the App Store, there is no update listed in current updates. When I select iMovie as if I'm going to buy it it says "update" in the box, but the asterisk-like wheel just circles forever. I have tried trashing the application, signing out and back in as suggested, but nothing changes.