I was trying to upgrade Mac OS and kept running into this error message when I tried to resume interrupted download. I was able to get around this problem by following steps mentioned below, which were originally posted in this post.
- Quit App Store.
- Open Terminal.
- Execute this: defaults write com.apple.appstore ShowDebugMenu -bool true
- Launch App Store.
- At the Menu bar, there should be a "Debug".
- Click on that and press "Reset Application"
- Restart App Store.
After resetting the app store I was able to initiate a fresh download of Mavericks.

6 comments:
Thanks! Finally something that worked...
It looks like if you manually downgraded to iTunes 10, you have to go back to 11 first. — http://forums.macrumors.com/showthread.php?p=18248525#post18248525
Thanks! fixed it!!
Wow thank you this worked for me!
Thanks!! Dude it's worked for me.,
thank's a lot
Thanks worked great!
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