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Trouble Shooting
What Is Installed
To discover what is installed by MacTeX-2012 and where it goes, read the linked document.
Support for Multiple TeX Distributions
New versions of TeX Live are produced approximately once a year. The previous version of MacTeX contained TeX Live 2011; the new version contains TeX Live 2012. Installing the new version preserves the old version, and it is easy to switch back to that version if the new TeX Live has a bug. To understand how that is accomplished, read the document on support for Multiple TeX Distributions.
Uninstalling MacTeX
If you change your mind and decide that you want to uninstall MacTeX-2012,
read these notes.
TeXnical Help
For further help with TeX, LaTeX, XeTeX, ConTeXt, check out the
MacTeX-Wiki and other TeX-related websites here.