While Autodesk Ecotect Analysis 2011 is no longer available for purchase, you can still get a free updated download from various sources. Here are a few options:
Since Ecotect 2011 was designed for older operating systems, modern users often run it in a "Compatibility Mode" or on a Windows 7 Virtual Machine to avoid crashing. How to Install Safely autodesk ecotect analysis 2011 free updated download
Provides cloud-based conceptual analysis and site design. Green Building Studio: Web-based energy simulation. Ecotect Analysis Discontinuation FAQ - Autodesk While Autodesk Ecotect Analysis 2011 is no longer
Autodesk officially discontinued Ecotect Analysis several years ago. It is no longer sold as a standalone product, nor is it officially supported with new updates. autodesk ecotect analysis 2011 free updated download