For installation just copy the exceltex helper script somewhere in your PATH for example $HOME/bin or /usr/local/bin, and make sure it is executable. The readimg.sty file should be copied somewhere LaTeX can find it, usually $HOME/texmf/tex/latex/misc or /usr/local/lib/texmf/tex/latex/misc. Dont forget to run 'texconfig rehash' afterwards. Thats it.
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