Structural Analysis for Revit is being discontinued
On June 30, 2018, Autodesk is discontinuing sales and support for Structural Analysis for Revit® software. The service will not work with Revit 2019. Please complete your projects, and download and remove data from the service before this date.
Consider moving to Robot Structural Analysis Professional
You can get similar functionality with Robot Structural Analysis Professional, which lets you test the effects of structural loads and verify code compliance using advanced BIM (Building Information Modeling) tools. The software, which integrates with BIM workflows, is available only in the Architecture, Engineering & Construction Collection.