Hi... I don't understand why the opigno install package is not preloaded with this library, after all if is needed that just don't make sense. I downloaded and placed pdf.js on sites/all/libraries/pdf.js I can successfully run the demo from pdf.js [ http://MyHost/opigno/sites/all/libraries/pdf.js/web/viewer.html ] Opigno just gives the error that "The pdf.js library could not be found." printscreen Error: http://s2.postimg.org/mcjir8e7d/pdf_js.jpg What I am missing? What you advise to do?