Unauthorized "portable" versions are usually unofficial repacks found on peer-to-peer sites.
: Active subscribers can typically download and use up to three previous versions of the software from their Autodesk Account. autocad 2005 portable full
You can download AutoCAD 2005 Portable Full from various online sources. However, I recommend being cautious when downloading software from third-party websites, as they may contain malware or viruses. autocad 2005 portable full
: Allowed users to continue working while a drawing or sheet set was printing in the background. Portable & Lightweight Advantages autocad 2005 portable full
: Autodesk does not offer a portable version of their legacy software. Using unauthorized versions violates terms of service. Modern Alternatives for Legacy Needs