Showing his commitment to buildingSMART’s openBIM and IFC standard, Autodesk has just released a new version of the IFC open source engine for Revit!
Autodesk has posted updates to IFC for Revit 2016 and IFC for Revit 2017, which you can get to using the links below:
IFC for Revit 2016 (v16.5):
https://apps.autodesk.com/RVT/en/Detail/Index?id=3754730560173591798&appLang=en&os=Win32_64
IFC for Revit 2017 (v17.2):