Solved: I have recently updated my preloaded window 8 to 8.1. However, after the update it does not accept my old window 8 key and requires me to. windows 10 non core edition activation key windows server 2016 non core edition activation windows non core edition activation Error: 0x80072EE7 On a computer running Microsoft Windows non-core edition, run 'slui 0x2a 0x80072EE7' to display the error ..