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Fix Mac App Store download issues

If you try to download an app or update (ours, or from any other developer) from the Mac App Store and get this message...

App Store Error: Failed to verify the preflight file. It is not signed by Apple.
...the problem is (most likely) caused by a setting in the Keychain Access app. Make sure the pop-ups for OCSP and CRL in Keychain Access > Prefs > Certificates are both set to "Best Attempt." This should fix the problem; more details are in this blog post.



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