I've got a simple HTML page written in oXygen XML Author 15. When I try the XHTML to DITA topic transformation scenario, it fails:

System ID: C:\temp\oxygen_blogpost.html
Scenario: XHTML to DITA topic
XML file: C:\temp\oxygen_blogpost.html
XSL file: C:\Program Files\Oxygen XML Editor 15\frameworks\dita\DITA-OT\demo\h2d\preprocess.xsl
Document type: XHTML
Engine name: Saxon6.5.5
Severity: error
Description: C:\Program Files\Oxygen XML Editor 15\frameworks\dita\DITA-OT\demo\h2d\preprocess.xsl (The system cannot find the path specified)