Download failed with App Store in Mavericks

Hello,
Here is the meesage that gives me in App Store Mavericks:
"Unable to verify the file pre-execution. This is not signed by Apple. Application will be available from the Purchasing page." in french because i am french.
Everything worked perfectly in Mountain Lion
Thank you for your help

Yes there have been occasional server bugs with the download.   Make sure your data is backed up and redownload once you are ready.

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