If you want to upgrade Hackintosh from Mountain Lion 10.8 to Mavericks 10.9. The first step should be creating a installation usb drive from UniBeast . Once you have download the Mavericks from AppleStore, you can launch UniBeast to create the installation drive. However, UniBeast has a limitation in the troubleshooting notes : " 3. UniBeast does not support running from or copying to Case-sensitive file systems. " If your /Application is on a case-sensitive partition, then you have to move /Application folder to another partition which is case-insensitive. The default "Mac OS Extended (Journaled)" is case-insensitive. Note: if you only move /Applications/Install OS X Mavericks.app folder to the case-insensitive partition, it still will not work, you need to move whole /Applications folders to another partition and create a soft link for it. REF: http://www.tonymacx86.com/unibeast/113297-how-i-got-unibeast-3-0-working-case-sensitive-filesystem.html