My app is "Damaged" when I try to open it

Last Updated: Feb 15, 2016 09:45AM GMT
This issue is related to the Apple WWDR certificate renewal that occurred yesterday (14th Feb 2016). This requires all Mac App Store users to re-authenticate with the Mac App Store by signing into their iTunes account.

See below the Apple information release on this issue:

How will customers be affected by the certificate renewal?

Users may receive a notification that your Mac app is damaged if it utilizes receipt validation to request a new receipt from Apple. They can resolve this issue by restarting their Mac or updating to OS X El Capitan (v10.11.2) or later.

Mac App Store customers running OS X Snow Leopard (v10.6.8) will be unable to purchase new apps or run previously purchased apps that utilize receipt validation until they install the Mac App Store Update for OS X Snow Leopard which is available via OS X Software Update.

If continue to get the "damaged and can't be opened" popup, please try the following:
  1. Reboot your Mac
  2. Open your Applications folder either by using the Finder or searching in Spotlight
  3. Find the damaged app and delete it
  4. Enter your Mac user password to authorize deletion, if requested
  5. Launch the Mac App Store
  6. Make sure you're logged in. (You may need to re-enter your password even if you were previously logged in.)
  7. Go and find the app you just deleted from the 'Purchases' tab on the Mac App Store
  8. Click on Install to re-download it.
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