It is a legitimate question. Nine years is ancient in software terms. However, several niches keep SolidWorks 2015 alive:
SolidWorks 2015: Empowering Design and Engineering Innovation solidworks 2015
If you are transitioning from a newer version back to 2015 (for legacy hardware or client specifications), here are the critical features you need to know. It is a legitimate question
: One of the standout features is SolidWorks Simulation 2015, which allows for Finite Element Analysis (FEA) directly within the CAD interface. This enables engineers to predict how products will react to real-world forces, heat, and vibration without needing to export files to external programs. : One of the standout features is SolidWorks
SolidWorks 2015 is widely considered a "user-driven" release that focused on streamlining repetitive tasks and improving overall software stability . Reviewers from the DEVELOP3D review Michael Lord's blog