Unlike PC architecture computers, Mac architecture computers are relatively long lasting machines.

If you have been using Mac computers for quite some time, you become tempted to fresh install operating system by deleting entire contents because your Mac computer becomes very slow to operate.

There is a way to fresh install your Mac operating system by “Fresh install using internet connection”.  You might think, by doing so, your Mac will always have the latest Mac operating system so long as your Mac device is capable of running the latest operating system…..  Wrong!!!  There are 3 ways to do “Fresh install via internet” as below.  But, for example, if your Mac is late 2011 model and you never updated your system, Mac OS X “Lion” will be installed on your Mac no matter which update method you take.

macOS Recovery installs different versions of macOS depending on the key combination you use while starting up. Turn on or restart your Mac, then immediately hold down one of these combinations:

Command (⌘)-R

Install the latest macOS that was installed on your Mac, without upgrading to a later version.*


Upgrade to the latest macOS that is compatible with your Mac.**


Requires macOS Sierra 10.12.4 or later   Install the macOS that came with your Mac, or the version closest to it that is still available.

* If you’re selling or giving away a Mac that is using OS X El Capitan or earlier, use Command-R to make sure that the installation isn’t associated with your Apple ID.

** If you haven’t already updated to macOS Sierra 10.12.4 or later, Option-Command-R installs the macOS that came with your Mac, or the version closest to it that is still available.

The link below will provide you how to reinstall Mac OS by internet.


For your information the following is the release history of Mac operating system

2006 Mac OS X 10.5 “Leopard”

2008 Mac OS X 10.6 “Snow Leopard”

2010 Mac OS X 10.7 “Lion”

2012 Mac OS X 10.8 “Mountain Lion”

2013 Mac OS X 10.9 “Mavericks”

2014 Mac OS X 10.10 “Yosemite”

2015 Mac OS X 10.11 “El Capitan”

2016 macOS 10.12 “Sierra”

2017 macOS 10.13 “High Sierra”

Most likely, Apple will be releasing their new operating system once a year from now on.

If the “Fresh install by internet” will give you OS X 10.7 “Lion”, you must upgrade it to at least OS X 10.8 “Mountain Lion” to enjoy the latest MacOS “High Sierra”.  But you usually do not have to worry about it if you have upgraded your Mac operating system previously through Apple store.  You can download it again by visiting;


Then you can upgrade your “OS X 10.7 Lion” to whatever the operating system you were using previously.  (Bear in mind, you have to upgrade twice to reinstall “MacOS 10.13 High Sierra” because of the following General Requirements of installing “High Sierra”.

MacOS “High Sierra” General Requirements

  • OS X 10.8 (Mountain Lion) or later
  • 2GB of memory
  • 3GB of available storage to perform upgrade*
  • Some features require an Apple ID; terms apply.

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

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