The most reliable way to get the full 2018 library is through official Autodesk channels. Autodesk Account Portal Log in to the Autodesk Management Portal Navigate to All Products and Services View Details and choose the 2018 version Available Downloads , click the
💡 If you only need a few specific items, modern versions of Revit (2021+) allow you to load families from the cloud. However, for 2018, a full local download is required. download revit family library 2018