View the complete list of compatible computers. If your Mac isn't compatible with macOS Catalina, the installer will let you know. Two installers included: 10.8.0 InstallESD and 10.8.2 App Store app. To find your macOS version, Mac model, memory, and storage space, choose About This Mac from the Apple menu . Putting a Bootable Lion Installation on a Flash Drive This process has a few steps. This is OS X Mountain Lion, released in mid 2012. * To upgrade from Lion or Mountain Lion, first upgrade to El Capitan, then upgrade to Catalina. (NOTE: There is a known issue with older versions of the Pulse Secure VPN client. Your Mac also needs at least 4GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier. Create a Mountain Lion bootable USB installation Open PowerISO and continue unregistered. If you're using one of these computers with OS X Mavericks or later,* you can install macOS Catalina.
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