https://knowledge.autodesk.com/sites/default/files/Revit2018_StructuralAnalysisExtension.exe
This is a complete informational write-up regarding , covering what the extensions are, their purpose, system compatibility, where to find them, the official download process, installation steps, and important notes regarding legacy software support. Download Revit Extensions for Autodesk Revit 2018
Autodesk provides specific add-ins and extensions (such as Site Designer or Structural Precast) through your subscription management page. https://knowledge