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Message: <blockquote data-quote="krs" data-source="post: 1812995" data-attributes="member: 67742">I tried the link you posted - that just takes me back to the app store and I end up with the same problem.two other things I came across when I researched this issue on the net.In one place they claim that two step installation, first 22Mb, then the whole installer, is done because a firmware update is required (maybe only on some Mac) - no ideas if that is actually true.Another place said to actually start the installation with the 22MB installer and then stop either before the target volume is selected or just after - there are different opinions here.I have not tried anything, I just made a backup of El Capitan, will boot into that and then try the the various options on the backup.</blockquote>