Add 'ei.cfg' to the sources folder of your 'Win8.1.iso'

Note:- Not required for 'Win 8.0'

Edit Options for 'Any', 'Core', or 'Professional'...

=======================
1. choose 'Any' Edition
=======================

[Channel]
_Default
[VL]
0

======================
2. auto 'Core' Edition
======================

[EditionID]
Core
[Channel]
OEM
[VL]
0

==============================
3. auto 'Professional' Edition
==============================

[EditionID]
Professional
[Channel]
OEM
[VL]
0
