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I'm a bit confused by the question and might be misunderstanding but there is no need to buy OS X upgrades, they're free. But you do need to register with Apple

by myko 4y ago

I'm a bit confused by the question and might be misunderstanding but there is no need to buy OS X upgrades, they're free. But you do need to register with Apple to get them.

wkat4242 4y ago
No you don't need to be registered or even logged in with an appleid to install updates or download them from the app store.