I also read that if you take your Mac to a Genius at the Apple Store, they have many past OSes, and they can install one for you. I have read that as long as you can find, say, a friend who has a copy of the El Capitan installer, then you can use a copy of his installer file to do your upgrade - legally, without any weird "side effects." I now have 10.9.5, the OS that originally came with the laptop, and I want to upgrade to something newer. I bought a used MacBook last week, wiped the hard drive last night, and performed the "Reinstall Mac OS" command (which took a couple hours).
(I originally mentioned some of this in a reply to the Is El Capitan still available for upgrade thread, but felt like I should start my own thread to ask for advice on this decision.)
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