When you download PRTG, you actually get the version. For 30 days, you have unlimited sensors (or at least a much higher cap depending on licensing). You can monitor your entire infrastructure, set up complex dashboards, and configure alerts.
When your network outgrows the freeware boundaries, Paessler requires a transition to a paid license. prtg freeware limitations
Using this baseline, a small network with just three servers, two switches, a router, and a firewall will completely exhaust the 100-sensor freeware limit. Operational and Commercial Restrictions When you download PRTG, you actually get the version