The current version of CADWorx Structure 2017 is compatible only with AutoCAD 2016.  It's important to note that CADWorx Plant Professional 2017 will run on AutoCAD 2014-2017. CADWorx Structure 2017 components can be xrefed or inserted into CADWorx Plant Professional 2016 or 2017. If you have any issues seeing the Structure components, load the object enablers available for CADWorx 2017 located on the website. You must be logged into the ECE Design website for download availability.