Inventor 2015 is the ultimate software program for 3D models of all your mechanical engineering designs. What's great about Autodesk Inventor is that the focus is on how the design works, rather than on the modelling process.

Inventor 2015 lets you draw using several centrelines and change your drawing to a frame, linkage, sheet-metal or other structure with a single click. You can also cost out and optimise designs. Inventor 2015 brings targeted, impactful additional features to the 3D environment. It also provides a powerful toolkit to improve productivity across a range of different work environments, for both new and advanced modellers. 

When you purchase a licence for Autodesk Inventor Professional 2018, you also have the right to use the 2015 version. This is the only way, in the new licensing structure, to "buy" Inventor 2015 (further information on licensing).