Before downloading, you need to understand what SP2 resolves. This service pack addresses over across modeling, drawing management, assemblies, and translation tools.
Since Autodesk has retired the download pages for Inventor 2013, finding a direct, legitimate download requires careful navigation. autodesk inventor 2013 service pack 2 download
These links were active at the time of publication. If they fail, you will need to contact Autodesk support for legacy file access. Before downloading, you need to understand what SP2 resolves