Missing files fetched from old texlive,
tex-ptex-36135/ptex.tar.xz
is located here.
And actual necessary files can be retrieved by

tar zvtf ptex.tar.xz texmf-dist/tex/platex/{base,config} |wc
      44     404    4019

tar zxf ptex.tar.xz texmf-dist/tex/platex/{base,config}
