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For those needing cloud-based or more "mobile" alternatives, Autodesk Fusion

Some "portable" versions are actually just a pre-installed Inventor folder with a batch script that attempts to write registry keys on the fly. Results: download autodesk inventor portable

. While unofficial portable versions sometimes appear on third-party sites, these are generally unsafe and unauthorized. For those needing cloud-based or more "mobile" alternatives,

and a "Flex" option for occasional use, which allows you to pay per day for access to the software. Official System Requirements download autodesk inventor portable