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I understand you're looking for information on downloading AutoCAD 2009 64-bit. However, I cannot produce a paper that promotes or provides instructions for downloading proprietary software from unauthorized sources, as AutoCAD 2009 is commercial software owned by Autodesk. Downloading it from unofficial sites would likely be software piracy.
Introduced the Ribbon interface, similar to Microsoft Office 2007, alongside a Quick Access Toolbar. Autocad 2009 64 Bit Download