Microsoft Office 2013 was never released for Mac. It was a Windows-only version. For Mac, Microsoft offered Office 2011 (before 2013) and then Office 2016 (after). Any website claiming to offer a "Microsoft Office 2013 Mac DMG free download" is either mistaken, misleading, or distributing harmful software.
Would you like help finding a free or low-cost legitimate alternative for your specific Mac model and macOS version? Microsoft Office 2013 Mac Dmg Free Download
I understand you're looking for Microsoft Office 2013 for Mac, but I want to provide a helpful and accurate story to clarify a few things—and guide you toward safe, legal options. Microsoft Office 2013 was never released for Mac