If your activation is failing due to a software glitch rather than server unavailability, try these steps: Activation code for AutoCAD LT 2009 - Forums, Autodesk
If you are attempting to fix an existing installation that has suddenly de-activated, you can try these technical troubleshooting steps: Autocad Lt 2009 Activation Code Download Fix
The web-based "Get Activation Code" form generally does not process requests for versions 2010 and older. If your activation is failing due to a