I cannot update from OS 10.9.4 to 10.9.5. I get a message saying: File couldn't be installed error (513). I have configured my OS so that I have read and write permission followed by system with read and writ permission. Can someone help me? Thanks.

Question

I cannot update from OS X 10.9.4 t0 10.9.5> Whenever I try I get the following message: File couldn't be installed error (513) and something about not having the proper permission.  Under the Macintosh HD sharing and permissions settings I have customized the settings so that (Me) has read and write permission followed by the system with read and write permission, wheel and everyone have Read permissions.
I have no problems updating apps such as Adobe CC or iTunes but cannot update the operating system, can someone help me? Thanks.

Answer 1

1. Restart the computer in safe mode. Certain caches maintained by the system will be rebuilt.
Safe mode is much slower to start up than normal. The next normal startup may also be somewhat slow.
When the login screen appears, restart as usual (not in safe mode) and test. There's no need to log in while in safe mode.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t start in safe mode. In that case, go to Step 2.
If there's no change after taking this step, continue.
2. Back up all data before proceeding.
Triple-click anywhere in the line below on this page to select it:
/var/folders
Right-click or control-click the highlighted line and select
          Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item named "folders" selected. Move the selected item to the Trash. You may be prompted for your administrator login password. Restart the computer and empty the Trash.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination  command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.