Download Portable Revit Extensions For Autodesk Revit 2018 -

After the installation is finished, restart Revit 2018. A new Extensions tab should appear on the ribbon, containing your newly added tools. Key Extensions for 2018

You just can't use Revit during that time. I actually welcome the subscription model since it forces employers to keep up to date. Autodesk Community, Autodesk Forums, Autodesk Forum How to download Revit 2018 - Autodesk Download Revit Extensions for Autodesk Revit 2018