If you have an active subscription, you can sometimes download versions dating back 4–5 years by signing in to manage.autodesk.com and using the Autodesk Assistant .
While there may not be a direct open-source equivalent to Revit, which is a professional-grade BIM software, there are other open-source BIM solutions like FreeCAD, Blender, and OpenLSS that can serve different needs. revit 2014 torrent portable