After upgrading to Mountain Lion on my MacBook Pro, I noticed an update was available for iPhoto '11 (version 9.4) I went to App Store -> Updates and it downloaded and than hung. The message I received was
iPhoto failed to download - Use the Purchases page to try again
I tried going through Purchases and get the same message. I'm caught in the "loop" and don't know how to get out. Now there's a red letter message beside the UPDATE button that says "An error has occurred"...
How can I download this upgrade?