In the logs for the server running the Essential Import Utility a warning is shown.
WARNING: This is an evaluation copy of ZK EE and will terminate after sixty days from the first date of installation. Should you require an open source license or commercial license for ZK EE please contact us at email@example.com for more information. Alternatively you can download ZK CE which is licensed under the LGPL.
We have been given the ZK open source license for the ZK/EE, which is applicable for GPL open source projects, like The Essential Project. The warning is a bug in the ZK package and there is no need to down-grade to the CE version to use the Import Utility and it is fully licensed as part of our open-source distribution.