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I opened GarageBand for the first time, to find that most of the loops required me to download the Apple Loops from Software Update. I agreed to this.

The App Store opened and gave me the option to install the update from Updates - I clicked Install and waited for the download to complete. It did, and then the installation began.

About half an hour later, the update is stuck on (Installing - Calculating...) This doesn't seem normal - the last time I installed the Loops, they were done in about ten minutes.

Force quitting and re-opening the App Store doesn't help, nor does a reboot. When I open the App Store, the update is still at the same process.

Is there anything that I could do to get the update to finish installing?

Here is a screenshot of the App Store in this state: The App Store in the state that I have described.

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up vote 10 down vote accepted

In an act of desperation, I managed to fix the issue by:

  • Deleting /Library/Updates
  • Doing

    sudo defaults delete /Library/Preferences/com.apple.SoftwareUpdate.plist RecommendedUpdates
    sudo defaults delete /Library/Preferences/com.apple.SoftwareUpdate.plist DidRegisterLocalUpdates
    

    in a Terminal session

  • Restarting the Mac

The update is re-downloading now.

Interestingly, before I tested these steps, I found the update ready to install in /Library/Updates, however when I tried to install the PKG file, Installer claimed that another installation needed to finish (?). Deleting it and restarting fixed the problem.

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Simply deleting /Library/Updates & restarting worked for me – Jon Jul 2 '15 at 16:29

Try deleting the cache located here:

~/Library/Caches/com.apple.SoftwareUpdate/

And the prefrences plist, here:

~/Library/Preferences/com.apple.SoftwareUpdate.pIist.plist

And start the application again. It should have flushed whatever updates that got stuck.

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That didn't work. I deleted the Caches file (and /Library/Preferences/com.apple.SoftwareUpdate since there wasn't one in ~/Library/Preferences) and opened MAS. However, when I clicked Update, the update restarted again from Installing - Calculating. – Faiz Saleem Feb 18 '13 at 13:17

Related to Emil's answer, I just wanted to add that I had a similar problem updating xcode. Simply clearing the cache and restarting App Store worked for me.

rm -rf ~/Library/Caches/com.apple.SoftwareUpdate/
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Had a very similar problem to this - updates stuck on the 'Checking for Updates' spinning icon. Reboot failed to fix problem.

Because I am a newbie, much of what was said above seemed difficult, so I thought I'd just try the one thing I could actually find on my machine, which was to delete:

~/Library/Preferences/com.apple.SoftwareUpdate.pIist.plist

This step alone seemed to fix things for me.

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just go to store option and click on reload page

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