HT202152: Mac App Store: Frequently Asked Questions (FAQ)
Learn about Mac App Store: Frequently Asked Questions (FAQ)
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Sep 9, 2014 7:00 PM in response to Lilbet1by Carolyn Samit,Make sure your Mac can run Mavericks > OS X Mavericks: System Requirements
If installed, disable anti virus software prior to downloading Mavericks.
Mavericks requires about 8GB's of free disk space.
Control click the MacintoshHD icon on your desktop or open the Finder, right or control click startup disk in the Sidebar on the left then click Get Info.
You'll see Available and Capacity. Make sure there's at least 15% available disk space.