Revit Structure 2013 Update Release 2

Revit Structure 2013 Update Release 2 is now available for download from Autodesk site. 
Update Release 2 (Build: 20121003_2115) is not a full install; rather it is using service pack technology similar to AutoCAD®- based products. Prior to installing the Update Release 2, please verify that you have already installed the First Customer Ship build of Autodesk Revit Structure 2013 (Build: 20120221_2030) or Update Release 1 for Autodesk Revit Structure 2013 (Build: 20120716_1115).


Link for more details:
Revit Structure 2013 Update Release 2

Source: Autodesk Site