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How do I upgrade my iMac from OS X El Capitan to a newer system?
You can't. El Capitan is the last version of macOS compatible with your model.
You can't. El Capitan is the last version of macOS compatible with your model.
You can't. That model is too old; any newer OS requires an iMac to be at least a late 2009 model.
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how do I upgrade my early 2008 IMac
