: Here’s what you should do: wipe your drive and start from scratch.That sounds radical, we know, but we’re such big fans of this option that we actually do this every six-months, wether or not there is an OS upgrade to be performed.I have an i Mac(Early 2009) running Leopard (10.5.8). The situation is this one: ✔ my i Mac version is listed under the upgradable devices ✘ Mac OSX 10.6.8 is required to be installed (due to Mac App Store introduction) on the i Mac I'm not a lawyer however my take on it is when OS X became a free upgrade it was dependent on having at least Mac OS X 10.6.8 or higher so IMO if you do not own a copy of Mac OS X 10.6 or higher then the legality is questionable and I'd say dishonest at the lease. Note that when I say own a copy I actually means having paid for a license to use (Mac) OS X either by the purchase thereof ,e.g.a Mac OS X 10.6 DVD, or later version having come installed on your Mac. Do you agree that if he calls the Apple store and asks to bring in his i Mac and they say that's fine that they will install El Cap, that his other solution is OK?
The reason Apple still sells OS X Snow Leopard is because it's the first version of OS X that includes support for the Mac App Store.
We'll start with upgrading to Snow Leopard from a Mac running an earlier version of OS X.
We'll tackle the downgrade question a bit later in this guide.
Also, keep in mind that basically all previous versions to Office 2016 might bring you trouble.
I intend to upgrade for that reason to 10.8 only, Mountain Lion.