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This method automatically provides the latest version available to your hardware, which for most compatible systems, is macOS 10.15.7.

Before proceeding with the download, verify that your Mac is compatible with macOS Catalina. Apple maintains strict hardware requirements for Catalina: hot download macos catalina 10157 dmg

Users who need an official copy of macOS Catalina 10.15.7 for a compatible Mac — for reinstalling, creating a bootable USB installer, or testing legacy software that requires Catalina. which for most compatible systems

Paste the following command into the Terminal window and hit Enter: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled Type your Mac administrator password when prompted. Press Y to confirm that you want to erase the volume. creating a bootable USB installer