HT203421: Troubleshooting the Mac App Store
Learn about Troubleshooting the Mac App Store
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Sep 29, 2014 10:15 PM in response to 271683by Carolyn Samit,Hi ..
Do you mean reinstall OS X?
If so, which OS X is installed?
Click the Apple top left in your screen. From the drop down menu click: About This Mac
Which version do you see?