Sierra MacOS 10.12 and High Sierra MacOS 10.13
System Requirements

 General Requirements

OS X v10.6.8 installed already or later
4GB of memory (Miss Mac recommends 8GB)
8GB of available space

Some features require an Apple ID; terms apply.

Some features require a compatible Internet service provider; fees may apply.

 Supported Models

(Late 2009 or newer)
(Late 2009 or newer)
MacBook Pro
(Mid 2010 or newer)
MacBook Air (Late 2010 or newer)
Mac Mini (Mid 2010 or newer)
Mac Pro (Mid 2010 or newer)
iMac Pro (2017)

And How do I tell which model I have?

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