: Because the software no longer receives security patches or hotfixes, using it exposes your system to vulnerabilities that newer versions have already addressed.

: Support is tied to the vendor-supported OS. If your operating system is no longer supported by its vendor, Autodesk support also ends for that platform. Risks of Using "Exclusive" Downloads from FileCR

As of March 10, 2025, Autodesk officially discontinued support and activation services for the 2015 and 2016 versions.