Download !free! Revit Extensions For Autodesk Revit 2018 (Premium)
https://download.autodesk.com/us/substance/Revit2018_QuantityTakeoffExtension.msi
By following the steps outlined in this article, you can easily download and install Revit Extensions for Autodesk Revit 2018 and start unlocking the full potential of your BIM software. Download Revit Extensions for Autodesk Revit 2018
Unlike Revit 2020 and newer, Revit 2018 does not have a single "All Extensions" installer. You must download individual .msi or .exe files for each extension you need. https://download