Improves installer reliability when upgrading to OS X. View the complete list of compatible computers. OS X 10.11.1 was an update to OS X 10.11 (El Capitan) that was released by Apple on October 21, 2015. 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 . Or click More info to see details about each update and select specific updates to install. If any updates are available, click the Update Now button to install them. * To upgrade from Lion or Mountain Lion, first upgrade to El Capitan, then upgrade to Catalina. If you have upgraded to macOS Mojave, follow these steps to keep it up to date: Choose System Preferences from the Apple menu, then click Software Update to check for updates.

(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.

How to update to mac os 10.11