If you need the for version 10.1.1.66, you cannot directly download it from a public URL — you must get it via:
If you specifically need the 10.1.1.66 version for a legacy environment (like Revit 2020.2.3), you may need to use the Autodesk Assistant to request specific older component installers . Installation Steps (Windows) Close all running Autodesk products . Download and unzip the installer file . autodesk licensing service 10.1.1.66 download
In the past, Autodesk relied on a technology called FlexNet (and the NLM - Network License Manager) almost exclusively. However, as the industry shifted toward subscription models and "Named User" licensing, Autodesk developed a new, proprietary licensing stack. This stack consists of the and the FlexNet Publisher . If you need the for version 10