Bentley ProStructures Object Enablers for AutoCAD

We are currently using AutoCAD and have AutoPlant and ProStructures models that we are referencing.

I am not able to access the downloads area for the correct ProStructures Object Enablers; I have been able to locate the AutoPlant Object Enablers for download in Bentley Communities.

We are using AutoCAD 2016. How can I download the object enablers in order to properly view the Objects in AutoCAD.

Is it possible to address this so future object enablers are available as basic access when a person creates a login?