This plug-in works independent of licenses, any license type will work.
ESET provides a separate component called ESET MSP Utilities (EMU) to manage MSP licenses.
This utility uses a provided "ERA Key" to generate and update licenses as needed.
All licenses should appear in ERA with an expiration date of approximately 3 months out, this updates automatically and should always appear to be approx 3 months.
When EMU is installed on an ERA server it automatically creates and manages a special policy called "BaseUP" along with a few other policies.
If the plug-in detects the BaseUP policy it will automatically create all plug-in managed policies under the BaseUP policy.
If EMU is not being used, the server licenses can be installed through the plug-in (optional)