#Install latest version of mac os x how to#
#Install latest version of mac os x mac os x#
#Install latest version of mac os x install#

#Install latest version of mac os x mac os x#

MacOS was first released in 1999 as Mac OS X Server 1.0, with a widely released desktop version- Mac OS X 10.0-following in March 2001. To ease the transition, versions through 10.4 were able to run Mac OS 9 and its applications in a compatibility layer. The transition was a technologically and strategically significant one. However, the current macOS is a Unix operating system built on technology that had been developed at NeXT from the 1980s until Apple purchased the company in early 1997.Īlthough it was originally marketed as simply 'version 10' of the Mac OS (indicated by the Roman numeral 'X'), it has a completely different codebase from Mac OS 9, as well as substantial changes to its user interface. That system, up to and including its final release Mac OS 9, was a direct descendant of the operating system Apple had used in its Macintosh computers since their introduction in 1984. Running a version of macOS on an external drive is a great solution if you wish to continue to run the version of macOS currently installed on your Mac.The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2012 and then OS X until 2016, began with the company's project to replace its 'classic' Mac OS.

#Install latest version of mac os x how to#

How to run an older macOS on an external drive Follow the instructions to reinstall macOS using the installer you just saved to the external drive (link to separate article above). Now click on Reinstall macOS or Reinstall macOS and Continue.Quit Disk Utility (Disk Utility > Quit Disk Utility).Select the main volume and click Unmount then Erase.To start this process, restart the Mac in Recovery Mode by holding down Command and the R key during restart. Next you need to completely erase everything from your Mac, restoring it to factory settings.Use this installation file to create a bootable installer on an external storage device.Download the installer of the version of macOS that you require from the Mac App Store.You will be wiping your Mac and installing the version of macOS you require on a clean slate. This is a process known as a clean install, which we look at in more detail here:

#Install latest version of mac os x install#

Note: This will wipe your Mac so make a copy of anything you want to keep! How to install an old macOS using bootable installer Your Mac will restart once the installation is complete.Select your startup disk and click Install.Click Continue and follow the on-screen instructions.

Once you see the macOS Utilities screen choose the Reinstall macOS option.

(It didn’t actually work for us when we tried, perhaps because our internet connection wasn’t good enough, but it should work in theory!) While we are talking about Recovery, you might like to try the following method of downgrading your Mac to the version of macOS it shipped with. How to downgrade to the OS that shipped on your Mac How to restore your Mac from a Time Machine backup.

Remember that if you recover from an old backup you will lose the data you have added since updating to the version of macOS you wish to uninstall.

Choose a Time Machine backup from before you installed the version of macOS you wish to revert from and click on Continue.

When you see the Utilities window choose Restore from Time Machine Backup and click on Continue.

Continue holding both keys until you see the Apple logo or a spinning globe.

Start up your Mac and immediately hold down.

Here are the steps you need to take to recover an older macOS from a Time Machine backup: