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Sep 22, 2016 8:10 PM in response to Kathryn6744by Carolyn Samit,Sierra won't run on a 2008 Mac ...
Mac Hardware Requirements
For details about your Mac model, click the Apple icon at the top left of your screen, choose About This Mac, then choose More Info. These Mac models are compatible with macOS Sierra:
- MacBook (Late 2009 or newer)
- MacBook Pro (Mid 2010 or newer)
- MacBook Air (Late 2010 or newer)
- Mac mini (Mid 2010 or newer)
- iMac (Late 2009 or newer)
- Mac Pro (Mid 2010 or newer)
Information above from this support article > macOS - How to Upgrade - Apple
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