Upgrading to Apple OS X Mountain Lion does introduces it's own set of annoyances, and one of them is auto system updates which does not allow system to power down until finished. With a slow internet speed and GB's of update to download this can be a real annoyance, as shown in the screenshot below the update would take more then a day to finish.
![MAC Appstore updates](http://www.megaleecher.net/sites/default/files/images/mountain-lion-auto-update-1.png)
Luckily, there is a way out as demonstrated below.
If you try to shutdown/restart your MAC while updates are downloading you will be shown following errors :
![Error - Cannot quit while while updates are in progress. OS updates must complete before the App Store can quit.](http://www.megaleecher.net/sites/default/files/images/mountain-lion-auto-update-2.png)
![Error - The application App Store canceled restart. To try again, quit App Store and choose restart from the Apple Menu.<br />](http://www.megaleecher.net/sites/default/files/images/mountain-lion-auto-update-3.png)
To continue restart/shutdown you will need to forcibly quite the MAC AppStore app by one of the following method :
1). Goto Apple menu > Force Quit, select "App Store" from the list, and click "Force Quit".
2). Hold down the Command and Option keys and press Esc (Command+Options+Esc), select "App Store" from the list, and click "Force Quit".
![](http://www.megaleecher.net/sites/default/files/images/mountain-lion-auto-update-4.png)
To avoid this in future, disable automatic updates from going to System preference -> Software Update dialog box. You can always download updates manually at full-speeds (multi-part using download manager) with full pause and resume capability using the OS X Manual Update download method blogged earlier.
![OS X Auto update](http://www.megaleecher.net/sites/default/files/images/mountain-lion-auto-update-5.png)
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