So my question: is there an old version ProTeXt
    (namely the one based on MiKTeX 2.6) available somewhere?

All old versions of protext (among other things) are archived at
ftp://tug.org/historic/systems/protext.  (Whether there was one based on
miktex 2.6, I don't know.)

I've added a link to tug.org/protext for this.

Thanks,
Karl
--
http://tug.org/protext/

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