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Helpful answers
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Aug 5, 2012 11:08 PM in response to hghkby Carolyn Samit,Try here first > Mac App Store: "An unknown error occurred (100)" when purchasing
If that doesn't help, try the following:
Disable anti virus software.
Turn off the Firewall in System Preferences > Security (or Security & Privacy) > Firewall
If that doesn't help, open the Finder. From the Finder menu bar click Go > Go to Folder
Type this exactly as you see it here:
~/Library/Caches/com.apple.appstore/Cache.db
Click Go
Move the Cache.db file to the Trash.
Now here:
~/Library/Preferences
Click Go
Move these files from the Preferences folder to the Trash.
com.apple.appstore.plist
com.apple.storeagent.pllist
Now here:
~/Library/Cookies
Click Go
Move the com.apple.appstore.plist file from the Cookies folder to the Trash.
Empty the Trash, try the App Store.