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The MacTeX Distribution is available on CTAN or on the TeX Collection DVD (free with membership of TUG or with many of the other Users Groups around the world). Redistribution of files from the MacTeX collection should be done with care after reading the License restrictions by copyright holders.
MacTeX consists of two pieces: MacTeX-2017 and MacTeXtras. MacTeX-2017 is an install package which installs everything needed to run TeX on Mac OS X. The package uses Apple's standard installer; installation takes four to eight minutes and is automatic. MacTeXtras is a collection of optional extras: Additional Front Ends, Spell Checkers, Documentation, and Showcase items.