: Autodesk no longer provides activation codes for this version as it falls outside their lifecycle policy, which typically supports only the current version plus three previous releases.
If you own a legal, original license, you can try these remaining official avenues: Reactivate AutoCAD 2008 - Autodesk Forums codigo de activacion autocad 2008 ultima
If you only need basic 2D DWG editing, try: : Autodesk no longer provides activation codes for