ERROR: [Error 3] The system cannot find the path specified: u'C:Program FilesSmith MicroPoser Pro 2012RuntimePythonaddonsOctaneRender for Poser64 Demo'

I had never seen this error, then had about 5 reports within a day or two.  It is actually caused by the plugin using the Poser Temp folder to store everything.  Unfortunately the Poser Temp folder can gets wiped at any time (and when it does, you get the above error).  So the latest release (not demo yet, sorry) uses the Poser Preferences folder to keep the important stuff instead of the Temp folder.  Sorry for the troubles you had :-

Paul

Creator of PoserPhysics
Creator of OctaneRender for Poser
Blog
Facebook