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Q: I presently have OS X Yosemite 10.10.5, meet all the qualifications I can see for an upgrade to El Capitan, but get the message "O ... I presently have OS X Yosemite 10.10.5, meet all the qualifications I can see for an upgrade to El Capitan, but get the message "OS X cannot be installed" on my hard drive after a reference to Time Machine being run on the drive. more