This release is the best you could find on the net, because:
- No Windows 8.1 Settings were harmed in the making of this ISO.
- No Programs are added to Windows.
- No Registry Settings were modified.
- No Unattended Settings were added to the ISO.

DISC#1:
32-bit RTM Sources:
en_windows_8_1_x86_dvd_2707392.iso
en_windows_8_1_n_x86_dvd_2707895.iso
en_windows_8_1_pro_vl_x86_dvd_2791634.iso
en_windows_8_1_pro_n_vl_x86_dvd_2791509.iso
en_windows_8_1_enterprise_x86_dvd_2791510.iso
en_windows_8_1_enterprise_n_x86_dvd_2791297.iso
9600.16384.130821-1623_x86fre_Client_SingleLanguage_EN-US-IRM_CSLA_DV5.ISO

These RTM Sources are the final Build 9600

Installation Indexes:
Windows 8.1 (Core) x86 / KMS-Activated
Windows 8.1 (Core) N x86 / KMS-Activated
Windows 8.1 (Core) Single Language x86 / KMS-Activated
Windows 8.1 Pro x86 / KMS-Activated
Windows 8.1 Pro N x86 / KMS-Activated
Windows 8.1 Pro with Media Center x86 / KMS-Activated
Windows 8.1 Pro VL x86 / KMS-Activated
Windows 8.1 Pro N VL x86 / KMS-Activated
Windows 8.1 Enterprise x86 / KMS-Activated
Windows 8.1 Enterprise N x86 / KMS-Activated

Release File: Win81AIO-20in1-x86-en-US-Jan2014.iso
Size: 2.94 GiB
Language: en-US (English – United States)
DISC#2:
64-bit RTM Sources:
en_windows_8_1_x64_dvd_2707217.iso
en_windows_8_1_n_x64_dvd_2707896.iso
en_windows_8_1_pro_vl_x64_dvd_2791292.iso
en_windows_8_1_pro_n_vl_x64_dvd_2791264.iso
en_windows_8_1_enterprise_x64_dvd_2791088.iso
en_windows_8_1_enterprise_n_x64_dvd_2791038.iso
9600.16384.130821-1623_x64fre_Client_SingleLanguage_EN-US-IRM_CSLA_DV5.ISO

These RTM Sources are the final Build 9600

Installation Indexes:
Windows 8.1 (Core) x64 / KMS-Activated
Windows 8.1 (Core) N x64 / KMS-Activated
Windows 8.1 (Core) Single Language x64 / KMS-Activated
Windows 8.1 Pro x64 / KMS-Activated
Windows 8.1 Pro N x64 / KMS-Activated
Windows 8.1 Pro with Media Center x64 / KMS-Activated
Windows 8.1 Pro VL x64 / KMS-Activated
Windows 8.1 Pro N VL x64 / KMS-Activated
Windows 8.1 Enterprise x64 / KMS-Activated
Windows 8.1 Enterprise N x64 / KMS-Activated
These 64-bit Sources are the Final Build 9200. The MSDN ISO source is the best image available on the internet.

Release File: Win81AIO-20in1-x64-en-US-Jan2014.iso
Size: 3.92 GiB
Language: en-US (English – United States)

x86 – x64 info:

DISM /Add-Package KBfiles added:
KB2862152, KB2868626, KB2876331, KB2884846, KB2892074, KB2893294, KB2893984,
KB2898785, KB2899189, KB2900986, KB2902892, KB2904266, KB2904440, KB2909569,
KB2913152, KB2913270, KB2913320, KB2916626, KB2917993, KB2883200, KB2894029,
KB2894179, KB2887595-v2, KB2898514, KB2901101, KB2906956, KB2908174,
KB2903939, KB2911134, KB2911106, KB2914218

Features:
-Non-Activated and Pre-Activated indexes. Take your pick.*
*Uses custom KMS folder in Windows directory. I’ve included the uninstall
script if you want to use a different activator later
-Highly Compressed install.esd recovery compression format.
-DaRT 8.1 integrated into boot.wim recovery options. Choose Repair
your computer, Troubleshoot, then MS DaRT options to open. Features
include an offline defender a/v scanner, password reset tool, registry
editor, offline hotfix removal, system file checker, and many more.

Notes:
-All indexes use original MSDN 9/9 Win8.1 isos with integrated hotfixes.
-Added ei.cfg to sources\ directory. You *HAVE* to extract the iso and
delete the file if you want to upgrade from a previous version of
Windows. Use the win81-pkeys.txt on the ISO for install keys.
-This version uses qad’s v6 KMS server service build with integrated
WinDivert functionality from Windivert 1.1.1 WDDK.
-Seems to fix the rare occasional setup bug where setup stops at 95 or 97%
I modified my export to esd method to include extra integrity check data.

Notes:
- First proper Win81AIO with pre-activation
- All indexes use original MSDN 9/9 Win8.1 isos with integrated hotfixes.
- Added ei.cfg to sources\ directory. You *HAVE* to extract the iso and
delete the file if you want to upgrade from a previous version of
Windows. Use the win81-pkeys.txt on the ISO for install keys