Autodesk offers a free web browser version of AutoCAD (AutoCAD Web App) that can open, view, and plot DWG files from any version, including AutoCAD 2009. You cannot edit extensively without a subscription, but you can export to PDF, measure, and add comments.
If you have a critical project trapped inside older files, remember that modern CAD solutions can seamlessly import, modify, and export legacy DWG formats without requiring you to run outdated or unverified software. autocad+2009+serial+number+and+activation+code