Autodesk AutoCAD LT 2021 Autodesk Inventor LT 2021 System Requirements: OS. See Release Notes for list of issues addressed. WebbAutoCAD Inventor LT Suite lets you choose the right tool for the job. This Service Pack updates Autodesk Inventor LT 2016 for all operating systems and languages. 2016 Product keys are required for installation of Autodesk products and are used to differentiate products that are both sold independently and as part of a product suite. Download SHARE Service Pack 2 for Autodesk Inventor LT 2016 fixes or addresses a variety of issues.