The perpetual license allows you to use the corresponding OPMONis version forever with a single purchase. But unfortunately, only as long as the installed operating system meets the requirements of OPMONis.
Bug fixes are of course free of charge. But for new features or support of the latest operating system you have to purchase an upgrade 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)