YaTeX set up

YaTeX is a major mode of Emacs for editing LaTeX.  It enables completions by typing the Tab key.

download from
http://www.yatex.org/

and untar by
tar xvzf xxx.tar

 move the folder to where the path is reachable.

in .emacs
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(setq auto-mode-alist
      (cons (cons "\\.tex$" 'yatex-mode) auto-mode-alist))
(autoload 'yatex-mode "yatex" "Yet Another LaTeX mode" t)

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will do.