Revizto does not support direct export of models from HydraCAD for AutoCAD. While the Revizto plug-in is still available after installing HydraCAD, exporting models directly might fail or provide incorrect results.
To export a model from HydraCAD:
In HydraCAD, save the model to a DWG file.
Open the file in AutoCAD that does not have HydraCAD installed, preferably on a different computer.
In AutoCAD, export the model to Revizto.