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MacTeX-2020 installs the complete TeX Live 2020 distribution. TeX Live runs on all modern operating systems, including Mac OS X, Windows, GNU/Linux, and various forms of BSD Unix. The distribution is the same on all of these systems; nothing has been added, subtracted, or modified to make it work on OS X. The decision to install the complete distribution rather than a useful subset is the result of advice from users new to TeX, who explained that when everything is installed, examples from books about TeX all just work.
MacTeX-2020 consists of several packages; a custom install option allows users to select which packages to install. The packages are
Two programs could not be included in MacTeX because their authors have not yet notarized them. Users should retrieve them directly from their web sites: