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.
