Even if you find a “working” portable version (usually cracked from an old 2020 build), you will quickly hit issues:
Go directly to https://www.autodesk.com/products/fusion-360/personal – the free personal license (for hobbyists, non-commercial). fusion 360 portable download install
Here's how to download and install Fusion 360 on a portable device: Even if you find a “working” portable version