Catalina MacOS 10.15 and Mojave MacOS 10.14
System Requirements

 General Requirements

OS X v10.8 (Moj) OS X v10.9 (Cat) installed already
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
MacBook (Early 2015 or newer)
MacBook Air (Mid 2012 or newer)
MacBook Pro (Mid 2012 or newer)
Mac mini (Late 2012 or newer)
iMac (Late 2012 or newer)
iMac Pro (2017)
Mac Pro (Late 2013)

And How do I tell which model I have?

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