This product was formerly known as Nastran In-CAD. To access the 2018, 2019 versions you can download Nastran In-CAD

Inventor Nastran software offers a wide-range of simulation spanning across multiple analysis types. It is a part of the Product Design and Manufacturing Collection ? delivering high-end simulation in a CAD-embedded workflow so engineers and analysts can make informed design decisions.

https://www.autodesk.com/