Before seeking a portable version, it is important to understand the current landscape of older Autodesk software: System requirements for AutoCAD 2009 - Autodesk
No registry entries or system files are modified on the host computer, keeping the machine clean. Portable Autodesk AutoCAD 2009
While Autodesk has officially retired this version, it remains a topic of interest for users with older hardware or those who prefer its classic perpetual-license feel over modern subscription models. Key Features of AutoCAD 2009 Before seeking a portable version, it is important
Released as part of the "Raptor" development cycle, AutoCAD 2009 introduced several interface changes that defined the look of the software for years to come: RAM: 1 GB for Windows XP; 2 GB for Windows Vista
Intel Pentium 4 or AMD Athlon (2.2 GHz or higher). RAM: 1 GB for Windows XP; 2 GB for Windows Vista.
Introduced a modeless palette, allowing users to keep the layer manager open while continuing to work on the drawing. System Requirements for 2009 Edition