However, in doing so you may run into a couple of differences. You can use Disk Utility to restore this image to an external drive as was the case with Lion. In the Shared Support folder you will see an disk image called "InstallESD.dmg," which contains all the files to boot to the OS X installer and upgrade your system. Go to the Contents > Shared Support folder.Right-click the installer and choose "Show Package Contents.".Locate the installer in your Applications folder.Quit the installer when it automatically launches.Purchase and download Mountain Lion from the Mac App Store.If you get errors when restoring the InstallESD image directly, then first mount it and restore the mounted volume to your desired external drive (click for larger view). In addition, be sure to fully update any third-party software as developers will be releasing updates to work with Mountain Lion's new sandboxing and security technologies. Running a general maintenance routine on your system may help by clearing out caches and other temporary items, and also go to Software Update and install any updates for your version of OS X. Before upgrading to Mountain Lion, try clearing up as many of these as possible. Apple's Time Machine is not the only option for this, and you can use a number of system cloning tools like SuperDuper and Carbon Copy Cloner for making mirror copies of your boot volume.Īs we use our systems, various odd problems may crop up, including slowdowns, application freezes and crashes, or other unwanted behaviors. Get a spare hard drive and enable Apple's Time Machine backup routine to make a fully restorable backup of your system. Do not close the lid or power off your Mac until installation is complete.If you do not have a backup routine set up on your system, then you might take advantage of this weekend to do so. During installation, your Mac may restart, or display a blank screen for a short time.In the Updates window, locate the line that says Catalina.In the App Store, on the left side of the window, select Updates.In the menu bar, click the Apple icon to open the Apple menu.Do not close the lid or power off your Mac until installation is complete.Īfter you've gone through the preparation steps, you need to download and install the latest version of macOS. During installation, your Mac may restart, or display a blank screen short time.When this process is complete, an installer application named Install OS X El Capitan is placed in your Applications folder.Follow the on-screen instructions to perform a compatibility check, and prepare for installation.In the archive, double-click InstallMacOSX.pkg.Double-click the downloaded archive, InstallMacOSX.dmg, to view its contents.The file size is 5.8 GB, so the download may take a while, depending on the speed of your Internet connection. Download the El Capitan installer from Apple.If your Mac is running OS X Lion or Mountain Lion, follow these steps to upgrade to El Capitan. If your Mac is running Mavericks or newer, you can proceed to upgrade to Catalina. * If your Mac is running OS X Lion or Mountain Lion, you must upgrade to El Capitan before you can upgrade to Catalina. The following versions of OS X and macOS can be upgraded to macOS Catalina. If anything goes wrong, you can restore your Mac to its previous state. Back up your dataĪlthough not required, we strongly recommend you back up your Mac before proceeding with an upgrade. However, you can still try to upgrade to El Capitan. If your Mac is not on this list, you cannot upgrade to Catalina.
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