Hello there! I have tried your solution (in this post:
*Go to the App Store and check out the Purchases List. If iPhoto is there then it will be v9.6.1
If it is there, then drag your existing iPhoto app (not the library, just the app) to the trash
Install the App from the App Store.
Sometimes iPhoto is not visible on the Purchases List. it may be hidden. See this article for details on how to unhide it.
http://support.apple.com/kb/HT4928
*
but iphoto was not on my purchased list. And then when I went to "unhide" it, there was no option to unhide apps under my account info. I don't think I had any apps hidden. Are there any other options to resolve this that you know of?