Updating an old os

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And ensure your device's battery is fully charged, as these types of updates take time to complete and should not be interrupted.Tap on "Software Updates" or the equivalent to enable your device to automatically check for the update.If you're reinstalling Yosemite, then you can find the operating system in the Purchased tab of the Mac App store.Check out the guide: How to Re-Download Apps From the Mac App Store.If you're running a version of OS X older than 10.6.x, you'll need to first purchase Snow Leopard and then install it on your Mac.The download is in excess of 5 GB, so it will take a bit of time.

Now that OS X Yosemite is installed, take a look around.Why take chances when all you need to do is backup your data before proceeding.Yosemite supports the usual installation options; upgrade install, which we will take you through in this guide, and clean install.In fact, it appears that Apple intends Yosemite to work with as many Mac models as OS X Mavericks does.To put it simply, if your Mac can run OS X Mavericks, it should have no difficulty with OS X Yosemite.

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