Using pirated software is an act of copyright infringement and can lead to significant civil or criminal penalties.
Searching for a "portable" version of AutoCAD for Windows 7 (64-bit) typically leads to unofficial, third-party modified versions of the software.
: Using unlicensed or modified versions of AutoCAD is a violation of copyright law and Autodesk's Terms of Use , which can lead to legal penalties or fines. Official Alternatives for Windows 7 Users