While installing the server for GRIOT, I couldn't activate it. It gave me error message about going to look for solution in the Control Panel.
Installation is done with GUI support. Server Core version alone would just give us a powershell window, which is not familiar to many, in this version of Windows Server.
It was said that this is due to wrong default key. So the solution is to enter the right key:
use the command line: slui.exe 0x3
for pop up window prompting new key.