Added download links for Security Update 2019-001, which is recommended for all users and improves the security of macOS.

This update is recommended for all users. The macOS High Sierra 10.13.6 Update adds AirPlay 2 multiroom audio support for iTunes and improves the stability and security of your Mac. It’s another way iPhone and Mac just click. Continuity Camera works in the Finder, Mail, Messages, Notes, Pages, Keynote, and Numbers. Or scan a receipt, and a straightened version is immediately available in the Finder as a PDF. You can take a photo of something on your desk and instantly see it in your Pages document. Just choose Insert a Photo from the File menu. Now you can use your iPhone to shoot or scan a nearby object or document and have it automatically appear on your Mac. Finally, applications like Safari, Spotlight, Notes, Apple Mail, and other have been polished up. Better graphics and VR supported have also been included along with backwards compatibility so you install the new OS in machine even from late 2009. There's a new file system, AFS, for better security, reliability and speed in file transfers. MacOS High Sierra is packed with new features and refinements.

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