Hi!
A free trial is meant to provide you with deeper insights and confidence in validating the data virtualization use case using the Denodo Platform in the cloud. So if you have finished your free trial I think you could signing up for a subscription on the AWS, GCP or Azure marketplaces is easy.
You can find more information about the Azure subscription choices here
https://www.denodo.com/en/denodo-platform/denodo-platform-for-azure
Hope this helps!