I downloaded an updated version of IPhoto to my iMac, but when I tried to open iPhoto after the update, iPhoto froze. I restored the earlier version of iPhoto using my Time Machine thinking that I would run the update again. After the restore, I tried to open iPhoto, but I got a message saying it would only open if I downloaded the new update for iPhoto. However, when I went to the App Store, the "update" button was replaced with a button that says it was already downloaded--I do not see a way to re-download the update again. Is there a way to re-download the iPhoto update again to access iPhoto? Thanks.