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Mac OS Yosimite "This copy of the Install OS Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading.”

From The Tech Department: How To Resolve “Application Can’t Be Verified” When Installing Mac OS

Jay and Conrad discovered today that MacOS install files downloaded from Apple have what amounts to an expiration date. And then they stop working. Anybody run across this error?: “This copy of the Install OS Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading.” […]