How to create a bootable installer for macOS – Apple Supportīefore upgrading make a full back up of your Mac.Ĭheck that third party apps you use have updates available for the new OS.Ĭheck that your printers/ scanners etc have updated drivers and software available for the new OS.Ĭonnect your mac to your router via cable rather than rely on WiFi.ĭo not use your mac while it is downloadingĪnd do not use any other devices that share the same internet connection.Īfter installing El Capitan you can then consider upgrading to High Sierra, when the High Sierra installer
It is also possible to create a bootable USB installer disk, using the Install OS X El Capitan.app in the Applications folder, and the createinstallmedia command in the Terminal app. If you need it in future, or you could just make a copy of the Install OS X El Capitan.app prior to installing and moving it toĪn external drive for safe keeping. The copy of the install app self deletes after installing El Capitan, so make sure you keep a copy of the InstallMacOSX.dmg To start the installation of El Capitan double click on the Install OS X El Capitan.app. Your Applications folder, it should be 6.2GBs in size. pkg to the Install OS X El Capitan.app which you will find in That and an installation window will open, this does not install El Capitanīut converts the. When downloaded open to InstallMacOSX.pkg, double-click on This downloads InstallMacOSX.dmg to your Downloads folder. Go to Section 4 and click on Download OS X El Capitan. How to upgrade to OS X El Capitan – Apple Support I would upgrade to El Capitan as an intermediary step, the download works slightly differently, read the instructions below. You cannot upgrade directly to High Sierra from Lion (the minimum requirement to upgrade to High Sierra is Mountain Lion)
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