Please note that I couldn't find any official sources for downloading AutoCAD 2006 Portable. It's essential to be cautious when downloading software from third-party sources, as they may contain malware or other security risks. If you're interested in using AutoCAD 2006, consider purchasing a legitimate copy from Autodesk or an authorized reseller.

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Keep in mind that AutoCAD 2006 is an older version of the software, and it may not be compatible with newer operating systems or hardware. If you're looking for a more recent version of AutoCAD, you may want to consider upgrading to a newer version.