If you have hardware or software that isn't compatible with Catalina, you might be able to install an earlier macOS, such as Mojave, High Sierra, Sierra, or El Capitan. For the strongest security and latest features, upgrade to macOS Catalina.If the installer shows a list of apps that are not optimized for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.When you're ready to install, just open the file named Install macOS Catalina from your Applications folder. Click Install to get started, or dismiss the notification to install later. A notification will inform you when macOS Catalina is ready to be installed. If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Catalina will download conveniently in the background, making it even easier to upgrade.
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