It says "an error has occurred" When I go into the mac app store to update to mavericks. it shows the file as downloaded, but its greyed out so I can't do anything with it. Does anyone know what I can do to sort this? Cheers.

Hi mking656,

Thanks for visiting Apple Support Communities.

Try these steps if you're seeing an error when downloading OS X Mavericks:

Mac App Store: "An unknown error occurred (100)" when purchasing

http://support.apple.com/kb/TS3637

Try the following steps to work around this issue:

1. Quit App Store.
2. Wait 10 seconds or more.
3. Open App Store again.
4. Navigate to the desired app.
5. Click Buy.

If the issue persists, try restarting your computer and attempting the app purchase again.

Additional Information

For other solutions to App Store issues, see Troubleshooting the Mac App Store

Regards,

Jeremy

Jeremy

I have exactly the same issue. Closing and restarting the App Store and restarting both take me back to the same less than helpful 'An error has occurred' message. I have no problems with the Mac App Store apart from this. Can you suggest a next move? I'm running a mid-2007 iMac.

Using Finder, go to the Applications folder and delete the partially downloaded Mavericks application. Then return to App Store and try a fresh download.

Thanks mikebean. This worked

Thanks Mikebean, That worked for me too. That's saved me a trip into the Genuis Bar, but then I'm not sure that's a good thing. I love going into the Apple Store. Cheers