You're using the Education Master Suite and the Eco Materials Adviser is not available. The add-in does not show up in the Tools > Add-ins list and you've already double checked the troubleshooting section in following document:
This issue only affects the 2013 Education Master Suite. To get your Eco Materials Adviser add-in installed, it's necessary to run the MSI installation program directly. It is located in the following location on the media – depending on the bit-type of your operating system:
32 bit OS: [media]\3rdParty\x86\Granta\EcoMaterialsAdviser2013-win32-en-US.msi
64 bit OS: [media]\3rdParty\x64\Granta\EcoMaterialsAdviser2013-win64-en-US.msi
Once the ECO Materials Adviser dialog initiates, please follow the on-screen steps to get the software installed on the machine.
NOTE: In some rare cases, it may be necessary to copy the MSI from the media to the computer itself.
Thanks to Daren Lawrence for this solution.