Autodesk does not authorize or support "portable" versions of its software (versions that run from a USB drive without installation). Any "Portable AutoCAD 2009" available on third-party websites is:
You can use the software on a library computer, a client’s workstation, or a shared office PC without needing administrative privileges to install files. Portable Autodesk AutoCAD 2009
Includes standard drafting and modeling commands. DWG Compatibility: Handles legacy files with ease. Action Recorder: Allows for basic task automation. ⚠️ Critical Drawbacks Autodesk does not authorize or support "portable" versions