HarePoint Workflow Manager Extensions for SharePoint 2013/2016 v1.2.x - 1 Server License - Includes 1 Year Maintenance (Technical support and version updates)

After your order has been processed, you will receive an email with your Registration Key and instructions on how to download your software, delivered by email, usually within 1 business day.

Server-based licensing - In this case the object of licensing is Web Front End server (WFE). You need to license all WFEs in your environment. The number of users is unlimited with this model.