For those who decide to avoid the gray area of unofficial software, there are mature, open-source CAD programs that are excellent alternatives to AutoCAD. Many are also available in portable versions, perfectly fitting the need for a lightweight, USB-friendly tool on 32-bit systems.
QCAD is another popular open-source 2D CAD system. Its portable version is a robust and professional tool for creating technical drawings. Its notable features include: Autocad Portable 32 Bit
This feature would allow AutoCAD to run complex drawings on 32-bit hardware by intelligently offloading non-active drawing data. For those who decide to avoid the gray
This requires manual registry merging and is for advanced users only. there are mature