If you prefer using a desktop application, you can also download and install the update directly from the Autodesk Desktop App.
Procedure for Downloading and Installing Revit Extensions for Autodesk Revit 2018 upd download revit extensions for autodesk revit 2018
Check if the .addin file for the extension is present in this folder. If you prefer using a desktop application, you
Select the 2018 version from the drop-down menu. upd download revit extensions for autodesk revit 2018