While the concept of a zero-installation CAD program is appealing, Autodesk does not officially manufacture or support a portable version of AutoCAD 2020. Unofficial copies found on third-party websites carry severe risks. Security and Malware Vulnerabilities
Any portable AutoCAD 2020 you find online is almost certainly a cracked, pirated, or unauthorized version of the software. Using it constitutes a direct violation of Autodesk's End User License Agreement (EULA). Autodesk's license agreements explicitly prohibit "unauthorized installation, access, or copying of the software". The license is typically non-transferable without Autodesk's explicit consent, meaning it cannot be shared between different organizations or, in many cases, different individuals. Portable Autocad 2020
System requirements for AutoCAD 2020 including Specialized Toolsets While the concept of a zero-installation CAD program