macOS version history - Wikipedia
Disconnect All External Peripherals. First, shut down your MacBook by pressing the Power button. … OS X Yosemite Available Now as a Free Download Oct 16, 2014 Apple MacBook Pro review: Apple MacBook Pro - CNET
Which OS should I upgrade my 2011 Macbook… - Apple Community Sep 12, 2017
Jul 20, 2020
Unibody MacBook Pro Mac OS X and Windows Compatibility Versions of the operating system earlier than the one that shipped with a particular Mac are not compatible.. MacBook Pro models running Mac OS X 10.5 "Leopard" or Mac OS X 10.6 "Snow Leopard" are capable of running essentially all Mac software written for Intel-based Macs and the vast majority of Mac OS X applications written for PowerPC-based systems using the "Rosetta Universal Binary Amazon.com: macbook pro recovery disk