Hello Guy,
Can you just rename the file? It only needs to have the .py suffix for Blender to see that it is, indeed, a Python script.
Also, I zipped it for you, which should make it extract with the correct suffix. Just move it to your Scripts/Add-ons folder (post-extraction) and Blender will see it immediately.
http://www.jamesalexander.de/render_clay.zip
Peace
James
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