As we do not have the particular Product or Serial Number you currently have, please refer to the links below for the troubleshooting steps associated to the error message you encountered.
Your links are not working anymore. I'm facing the same problem, when Ecotect starts I receive tha message:
ERROR: The licensing system failed to initialise.
Application will run unlicensed.
If I access Help -> Product and License Information, I receive the message:
Autodesk Ecotect Analysis 2011 is currently running unlicensed so saving and printing is not possible.
I used the serial as informed in my email.
Refer to thisfor some troubleshooting steps. Feel free to post on this too for further clarification or additional questions.
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