This article explains the two different versions of GFI EventsManager, and how it is licensed. Unfortunately GFI doesn’t break them down on its website, and thus creates some confusion to potential customers.

EventsManager Complete:

Formerly GFI EventsManager for Servers, GFI recently added an active monitoring component to the software. This is similar to GFI Network Monitor and adds the ability to monitor services, CPU utilization, hard drive space and more. This version also allows to you to manage event logs from Windows Servers, W3C logs and Sys logs from network devices such as Cisco routers and switchers. You are not able to manage logs from computers running Microsoft Windows (workstations) this product is licensed per node.