The purchase button must be visible on this page as shown below
When you purchase it will take you to the following page. Click manage orders
It will take you to the following page
Workbench click the order number. It will take you to the following page. Click the following button to configure the product
Switch to the following tab to deploy the license via command line. Click deployment license key to download the license file. Once download it rename it as license.yaml and proceed to the next page of this guide.