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Adding the Revit Infraworks Updater
Like a lot of these applications, Autodesk needs the help of a separate add on to bridge the gap (pun intended). You will need two take two steps to get the add on you need. It is called the Autodesk Infraworks Updater. This will allow you to import an IMX file into Revit.
Note: you need to be running the same exact version of Infraworks and Revit for this to work.