Use the following official links to find your desired version: macOS High Sierra 10.13 macOS Mojave 10.14 macOS Catalina 10.15
You need a Mac model from late 2009 (iMac/MacBook) or mid-2010 (Pro/Air/Mini) or newer, with at least 2GB of RAM and roughly 14.3GB of available storage. download os x 10.13 or later
It is highly recommended to use Safari for these links, as other browsers may not trigger the App Store correctly. Use the following official links to find your