To obtain an unrestricted evaluation license for the Denodo Platform, please contact the appropriate Denodo Sales Representative for your region or organization.
You can find contact information for our regional offices on our website at http://www.denodo.com/en/company/denodo-offices or you can fill in a Contact Request at http://www.denodo.com/action/contact-us.
Once you have obtained your evaluation license, you will be able to upgrade your Denodo Express installation by downloading and applying the latest Denodo Update from the Denodo Support Site.
With this license you can download (from the Denodo Support Site) and load the OData extension. You will be able use the full Denodo Platform for the evaluation period.
Hope this helps.