Consult the enhancements documentation for areas improved by this update. This update release is not a full install; rather it uses service pack technology similar to AutoCAD-based products. Prior to installing Update Release 6, please verify that you have already installed one of the following builds of Autodesk Revit MEP Update Release 3 Build:
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Revit MEP 2015 Tutorial - Revit MEP 2015 Overview