Proceed to the website of Autodesk, Inc.
DOWNLOAD NOW

Alternative software

AutoCAD Civil 3D
17.2.711
It's designed for civil engineers, designers working on transportation design.
DWG TrueView 2007
17.0.54.190
FREE
DWG TrueView: Free application for viewing and plotting DWG and DXF files.
DWG Recovery Free
1.0
FREE
This is a program that help you recover corrupted AutoCad files.
SplitView 2011
6.0.4
SplitView lets you take advantage of your widescreen or high resolution monitor.
Revit 2011 EPix Plugin
1.0
FREE
Free software that allows you to export a 3D view.