View the complete list of compatible computers. If your Mac isn't compatible with macOS Catalina, the installer will let you know. To find your macOS version, Mac model, memory, and storage space, choose About This Mac from the Apple menu . * 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. If you're using one of these computers with OS X Mavericks or later,* you can install macOS Catalina. If your Mac supports Internet Recovery, you can use this guide to find out which version of macOS you will get using the following options. The 10.7.
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