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I upgrade my Macbook to El Capitan as soon as I could, and have had very few issues with the release. On my iMac at work though, I’ve been putting off the upgrade since last October – due to time constraints and not wanting to mess anything in my dev environment up. Today I tried to install El Capitan using the Install OS X El Capitan.app installer. I was greeted with this message. How could this be? The installer has simply been sat in my Applications directory since October, nothing has ch...