It’s not entirely clear why some users run into the corrupted download problem but deleting the installer and trying again seems to fix it every time. Some people have reported more success with the “Purchases” tab, so you can try that if you’re having trouble elsewhere. Download Mavericks again from the App Store search, the ‘Purchases’ tab or by choosing ‘Download’ from the direct link.Locate and delete the “OS X Mavericks” installation file that is damaged or not working properly.Close the App Store application and go to the / Applications / directory.This is easily solved by doing the following:
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Some Mac users have encountered an issue where the Mavericks installer got corrupted during the first installation attempt. A nice big “download” button is easy and obvious, but don’t forget Download and fix a damaged OS X Mavericks installer This is clearly much easier than it used to be in previous versions of OS X, which required several Option + Click maneuvers, causing a lot of confusion and frustration for many users.