Autodesk maintains an archive of older software via their "Virtual Agent." Go to the official Autodesk website and search for "Autodesk Virtual Agent" or navigate directly to the downloads section.
: Active members can typically find legacy software versions listed in their Autodesk Account page Essential Text and Learning Resources New AutoCAD Mechanical 2016 Download
If you are planning to download this software, you are likely interested in the specific toolset that separates it from standard AutoCAD. The 2016 release introduced several enhancements that streamlined the mechanical design process. Autodesk maintains an archive of older software via