iPhoto won't open after upgrade to yosemite, update is not available in the app store in US?
I've updated my Mac Pro to Yosemite and now iPhoto won't work and there's no date in the app store. Any ideas?
Update to iPhoto version 9.6.1. It is the only compatible version with Yosemite MacOS X 10.10.3 or later.
Apple stopped selling iPhoto, so it is a bit tricky to update. You will neither find an update on the Updates page of any App Store nor can you purchase iPhoto any longer. The update message, when you try to launch iPhoto is sending you on a wild goose chase. The only way to update is by reinstalling iPhoto, if you already own iPhoto and your purchase is associated with your AppleID at the Mac App Store
Barney-15E's user tip explains how to update to iPhoto 9.6.1 by reinstalling your purchase.
See this link: Get iPhoto 9.6.1 if you didn't update before OS X 10.10.3
If your iPhoto version is not listed in your Purchase history, you can open your iPhoto Library in the new Photos.app.
See: Notes on Migrating an iPhoto Library from iPhoto to Photos for Mac