I just received these instructions from a Senior iTunes advisor.
This worked for me.
1) Make sure that Mac OS X has all available updates installed (this is done by clicking on the Apple menu > Software Update.)
2) If it's open, quit the App Store application by clicking on the App Store menu > Quit App Store.
3) In the Finder click on the Go menu > "Go to Folder " and type (exactly as shown, with the same punctuation and capitalization, without the quotes): "/Library/Application Support/App Store" and click the Go button. If a folder opens and contains a file named adoption.plist please drag this file to your Desktop.
4) If you have any iLife applications (iPhoto, iMovie, Garageband) already installed please drag them from the Applications folder to the Trash.
5) Re-open the App Store application, click on the Updates section, and accept any iLife apps shown.
This worked for me.
1) Make sure that Mac OS X has all available updates installed (this is done by clicking on the Apple menu > Software Update.)
2) If it's open, quit the App Store application by clicking on the App Store menu > Quit App Store.
3) In the Finder click on the Go menu > "Go to Folder " and type (exactly as shown, with the same punctuation and capitalization, without the quotes): "/Library/Application Support/App Store" and click the Go button. If a folder opens and contains a file named adoption.plist please drag this file to your Desktop.
4) If you have any iLife applications (iPhoto, iMovie, Garageband) already installed please drag them from the Applications folder to the Trash.
5) Re-open the App Store application, click on the Updates section, and accept any iLife apps shown.