HT1557: About firmware updates for Intel-based Macs
Learn about About firmware updates for Intel-based Macs
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Helpful answers
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Apr 1, 2014 1:59 PM in response to HarryiTby Eric Root,Go to your User Library/Preferences/com.apple.appstore.plist. Move the .plist to your desktop.
Open the application and test. If it works okay, delete the plist from the desktop.If the application is the same, return the .plist to where you got it from, overwriting the newer ones.
Connecting to App Store Problems
App Store support. There is troubleshooting and a contact link.