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OS X Installer Certificate Update

All OS X installers that were downloaded before February 14, 2016 now longer work if you haven't used them yet. This is due to a certificate expiration and update. Note that this only affects OS X installers, not regular software installers. This actually affects me, as I downloaded the OS X El Capitan installer, but I never found the time to actually install it. So here I am needing to install a new version from the Mac App Store.  
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