You can obtain a ManageEngine OpManager license key in the following ways:
Registering Your ManageEngine OpManager License To fully unlock the capabilities of ManageEngine OpManager , you must register your product with the XML license file provided by the ManageEngine team. OpManager uses a , meaning you are charged based on the total number of devices monitored, regardless of how many interfaces or sensors those devices have. How to Apply Your License Key Manageengine Opmanager License Key
Ideal for small networks ($595 for 10 devices). You can obtain a ManageEngine OpManager license key
If you are an MSP, ask for (tenant-based, not per-device). It is often cheaper per endpoint. ask for (tenant-based