Buy Workflow Scheduler license for each web front-end server.
Download Server ID Generator. You can find download link in the e-mail message with order number from our online store. Run it on WFE server of your farm.
Copy generated keys and send them to email@example.com. Specify your WFE server names and the order number in the email message.
We will generate licenses for you and will send them to your e-mail within one day.
Place received *.license files in the root folder of all Sharepoint web-applications on WFE-servers according to generated keys. If you use port 80 it is usually here: c:\inetpub\wwwroot\wss\VirtualDirectories\80\