"Portable" versions of licensed software are often modified by third parties. , as these wrappers are common vectors for malware. If possible, use the official installer in a virtual environment rather than a pre-packaged portable fix.
Services like (free for public documents) or Autodesk Viewer (free) run in a browser. You do not install anything—just upload your DWG. This is the ultimate "portable" solution because it works on any computer with Chrome and an internet connection.
Downloading an "AutoCAD 2005 Portable Fix" from torrent sites, file-sharing forums, or sketchy "crack" repositories is extremely risky. Here is what you are actually downloading 99% of the time:
: Many users utilize tools like the Longbow Converter App to resolve 64-bit compatibility issues, allowing AutoCAD 2005 to run natively on modern systems.