Switching back requires only a single button click due to a feature explained below.Gerben Wierda and Jerome Laurens designed a data structure to support multiple Te X distributions on a machine.When a new version of Te X Live is installed by Mac Te X, the new version does not overwrite the previous version.This makes it possible for users in the middle of an important project to safely update, because they can switch back to the earlier version if they run into trouble.Using this structure, Te X Live and Basic Te X easily coexist on a machine.
In that case you will need to fetch La Te X from CTAN and install it on top of your distribution. If you’re new to Te X and La Te X or just want an easy installation, get a full Te X distribution.
La Te X is free software under the terms of the La Te X Project Public License (LPPL).
La Te X is distributed through CTAN servers or comes as part of many easily installable and usable Te X distributions provided by the Te X User Group (TUG) or third parties. La Te X is not a stand-alone typesetting program in itself, but document preparation software that runs on top of Donald E. Te X distributions usually bundle together all the parts needed for a working Te X system and they generally add to this both configuration and maintenance utilities.
If you want to discuss a possible contribution before (or instead of) making a pull request, we suggest you raise the topic first on the LATEX-L list or drop a line to the team.
Ulrik Vieth has collected historic versions of La Te X from La Te X 2.0 for Te X 1.0 (released on 11 December 1983) onwards. All files have been pulled from the SAILDART archive site at (no longer online) which was based on archive tapes from SAIL at Stanford.Follow the same procedure if instead you obtained Basic Te X.