When setting up an E Series terminal and error message comes up saying invalid license you must make sure the Server URL is configured for the right Terminal Management System.
To access the menu press the four corners of the Q20 terminal clockwise (top left, top right, bottom right, bottom left)
1.Settings
2.App management.
3.Configurations
4.Server URL
5.TMS type
Server URL for E series must be T.PAXSTORE.US
Port number 9080
TMS type must be BROADPOS not PAXSTORE