Q: iPhoto - won't upgrade after Maverick upgrade

Paul,

did you use a different Apple ID, when you set up your Mac? Or did someone else set up iPhoto for you, using a different Apple ID?

To be able to update iPhoto, sign out of the App Store (from the Store menu) and sign in again using the Apple ID that has been used, when you set up your Mac or installed iPhoto originally.

-- Léonie

If you do not remember the password of your older Apple ID, you can reset it at

iforgot.apple.com

If the rescue email is not working and you do not know the answers to your security questions, contact Apple Support: 

      Apple ID: All about Apple ID security questions

You need to delete the apps that produce the error, then purchase them using your Apple ID in the App Store. This problem arose because either you have changed your Apple ID since they were purchased or you bought the computer from another person who failed to remove them from the computer before selling it to you.

The point is did you change the Apple ID? Did someone else purchase them using a different Apple ID? Are you trying to redownload them from the Purchases listing in the App Store?

Exactly what are you trying to upgrade? Is it an older version of iPhoto? You may be trying to upgrade aversion of iPhoto that is before 9.x.x and, thus, not eligible for a free upgrade meaning you must purchase the current version of iPhoto (just a guess on my part.)