ObjectEnabler for ProStructures V8i SELECTSeries 6 (Build 8.11.11.87) ProStructures is a bundle of ProSteel and ProConcrete.
ProStructures OE is delivered for Navisworks 2010-2015 32 and 64 bit.
AutoCAD 2013 has a error in ACIS mode, so its better to use either 2012 or 2014 file format in the settings in Navisworks.