Hi and
to the forum.
A quick Google search showed that
Klabauter Shop in Germany currently have 2 PI-400/HPC programming cables in stock:
Make sure you purchase the PI-400/HPC
not the PI-400/VEC which uses different connectors and programming software for the Vector controllers:
I have also attached a RAR file containing the HPC programming software and user instructions for the HPC controllers in case the version you already have is incorrect.
Alan