Download Mac App Store
The new Mac App Store can be downloaded easily, to get the new Mac App Store on your Mac OS X computer. Simply update your Mac to the newer version and you are good to do.
Go to the top left hand corner and click on the Apple logo.
From the drop-down menu click on Software Update.
The Mac will then begin checking for new software updates. Follow the on-screen instructions to complete the update.
Once you have the latest update you can launch the App Store from your Mac computer. Access the App Store from the new icon on your Dock or from the Apple logo Menu.