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The best way is to extract the folder "luxrender" from the zip package to [PoserPath]/Runtime/Python/PoserScripts.

I tried it on a fresh installed Poser 2010 and it works this way.
 

makes no difference. same error message as before, just one folder up.

Don't know why this does not work for you.
The test for correct folder is now only done for Poser versions less than 7.  Please re-download and post if this works for you too.

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