I'm trying to open the iMovie app on my Macbook, but it has an X on the icon and when I click on it, it tells me I to upgrade the app in order to get into it. In the Mac App Store, I checked for new updates, and indeed there is a new update for iMovie (along with iPhoto and Keynote updates). To do the updates, I pressed update all, but only the iPhoto and Keynote updates actually happened (the iMovie update is stuck loading) My computer freezes and fails to update iMovie.

How can I get iMovie to open?

Edit: The update is to iMovie 10.1.4

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