: Since AutoCAD 2009 is retired, online activation may fail. You may need to use the "Request an activation code using an offline method" option and contact Autodesk Support to see if they can provide a manual code.
For more details on legacy compatibility, you can view the official AutoCAD 2009 System Requirements on the Autodesk website. Are you encountering a specific error code during the AutoCAD installation process? download windows media format 9.5 autocad 2009