Hi.
Im followijng the instructions as given on your web page for the plug in.
the first step is:
Open the Hypershade and in the Node Editor, create a Substance Texture node.
However no where in Hypershade is there a 'Substance Texture' node.
Can you add a picture of where/what you are calling a substance Texture please?
Where does it appear in the create Render node menu or is it somewhere else or described differently?

Some clarification on what a substance texture node is, where it can be found in the menu would be most helpful
Regards