The best choice is to choose the subscription license. As long as your license is valid, you always have access to the latest OPMONis version.
The subscription license can be paid monthly or annually and is automatically renewed until you cancel it. If you cancel your subscription, you are not longer allowed to use this license.
When the power is gone, OPMONis is there
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System Requirements
Running on Windows platforms using .NET runtime (4.7.2 or newer)
Supported protocols: vSphere API (VMware Web Services) which can monitor and control VMware ESX / ESXi / vCenter Server, XenServer Management API with .NET language binding, Windows Management Instrumentation (WMI) to be able to control Windows Systems and Hyper-V, Secure Shell (SSH), Internet Control Message Protocol (ICMP, PING), Wake on LAN (WOL)