Just installed Autodesk's Revit Structure 2011 Suite from a dowloaded file.
This the first time that Autodesk default installation requires no Digital Disks.
Installation went smoothly and very easy without encountering any problems.
My System:
OS: Windows 7 Professional 64 bit
Processor: Intel Xeon CPU W3520 @ 2.67 GHz
Memory: 16 GB
Graphics Card: NVIDIA FX-3800