I downloaded Yosemite and now my iPhoto has a bar across it and will not open. I need to update to the latest version. The app store says the latest version is not available in the Canadian Store. What can I do.

Im having the same problem but Im in the United States. When I look for the update, it doesn't show in the app stores update section. But when I go the purchases section, it does say update, but if I press the button, it highlights, and nothing happens.

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

One question often asked: Will I lose my Photos if I reinstall?

iPhoto the application and the iPhoto Library are two different parts of the iPhoto programme. So, reinstalling the app should not affect the Library. BUT you should always have a back up before doing this kind of work. Always.

Its downloading! It says it'll take about an hour, but Ill let you know if it works tomorrow! Thanks again!!!!