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.