82:  How do I update Emacs to the latest version?

  Follow the instructions in question 81.

  Emacs 19 places nearly everything in version-specific directories (e.g.,
  /usr/local/lib/emacs/19.28), so the only files that can be overwritten
  when installing a new release are /usr/local/bin/emacs and the Emacs Info
  documentation in /usr/local/info.  Back up these files before you install
  a new release, and you shouldn't have too much trouble.