HT1338 10.8.2 update fails to install and hangs. How do I remove it so I can re-install?

Downloaded 10.8.2
nothing happened, did not reboot.
rebooted manually. system not updated.
when I try to download again, app store says it is installed but nothing happens
How can I remove the ghost of the failed update so I can download a fresh copy?

Hello:
The combo update may be downloaded from here:
http://support.apple.com/kb/DL1581
Barry

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