Poser integration via GoZ was implemented by Smith Micro rather than by Pixologic. As a result, ZBrush "out of the box" does not have the necessary components to work with Poser. Those files are provided by Smith Micro, along with instructions for how to install them.
For these reasons, it is not possible for Pixologic to provide support for GoZ with Poser. We can provide support for ZBrush itself but if you are having difficulties setting up or using GoZ with Poser you will need to contact Smith Micro directly.