Archive of https://kasper.phi-sci.com/tex++ (See also "cpptex", e.g. at https://github.com/syntheticpp/cpptex) which modernizes it.
wget shows that the timestamp on the files is July 2010. I've downloaded the website as well, as it has some useful comments on what the author thought were problems.
The contents of keep_this_old_version.tar.gz have date of July 2003.