how do I upgrade my early 2008 IMac
How do I upgrade my iMac from OS X El Capitan to a newer system?
You can't. That model is too old; any newer OS requires an iMac to be at least a late 2009 model.
(183174)
2 replies
You can't. El Capitan is the last version of macOS compatible with your model.
how do I upgrade my early 2008 IMac