The closest official thing to a portable install is accessing Fusion via a web browser. This requires and works on any computer with an internet connection. URL: fusion.online.autodesk.com
A common alternative is to leave Fusion installed on a powerful workstation and use tools like Chrome Remote Desktop to access it from a less powerful or restricted laptop. autodesk+fusion+360+portable+install
Since your license is tied to your Autodesk ID , you can install Fusion on multiple computers (home, work, laptop). Your projects will sync via the cloud, allowing you to pick up exactly where you left off on any machine. 🛠️ Comparison of Portable Options Autodesk Fusion Runs in a Browser – But Not for Everyone The closest official thing to a portable install