The Mac App Store has a debug menu. To enable the debug menu, enable the ShowDebugMenu key in com.apple.appstore. To do so: defaults write com.apple.appstore ShowDebugMenu -boolean YES Once enabled, there are a number of options to show the folder where apps download, enable logging, clear cookies and reset the Mac App Store. To turn the Mac App Store debug menu back off: defaults write com.apple.appstore ShowDebugMenu -boolean NO