Autocad 64 Bit Portable |verified|
A powerful, open-source parametric 3D modeler that features a very clean, modular architecture. Conclusion
"Portable" software is typically packaged as a single folder or executable that can be run directly from a USB drive or external hard disk. Unlike a standard AutoCAD installation, which creates numerous registry entries and system files, a portable version is designed to keep all settings and preferences within its own directory. Autocad 64 Bit Portable
If you need AutoCAD "on the go" without a heavy installation, consider these official and safer options: AutoCAD Web App: A powerful, open-source parametric 3D modeler that features