Avoid Download Issues With Mac App Store Purchases
Over the last few days, several users let me know they were unable to download our apps from the Mac App Store. They reported that they were receiving this error message when trying to purchase or update:
App Store Error: Failed to verify the preflight file. It is not signed by Apple.
[…]
In theory, Apple (in exchange for their 30% cut of our revenue) should be helping these users solve such problems. But based on what I’ve heard, that’s not usually the case, so they end up writing to me. After a bit of web searching, I found the cause and solution to the problem: Keychain Access.
