Windows 8.1 - Server 2012 R2 MSDN Dec15-2014 en-US en-GB

This torrent contains an x64 source iso and delta patches to other versions.

All x64 Windows 8.1 editions use en_windows_8.1_with_update_x64_dvd_6051480
as the source ISO. You must extract this from the 7z file or copy it to the
folder containing the exe patches if you already have it in possession.

All x86 Windows 8.1 editions use en_windows_8.1_with_update_x86_dvd_6051550
as the source ISO. You must first apply the delta patch from the x64 ISO to
the 6051550 ISO by running the exe file or copy it to the folder containing
the exe patches if you already have it in possession.

All x64 Server 2012 R2 editions use
en_windows_server_2012_r2_with_update_x64_dvd_6052708 as the source ISO. You
must first apply the delta patch from the x64 6051480 ISO to the 6052708 ISO
by running the exe file or copy it to the folder containing the exe patches
if you already have it in possession.

7z container file for 6051480:
File Name: en_windows_8.1_with_update_x64_dvd_6051480.7z
Size: 3.47 GB
SHA1: C95EEF275B0A09CB0C30BDF9C25A3F5FDAA6D0E1
Format: LZMA1, no PW

EXE hash list is in exe-delta-patch-sha1.txt

MSDN hash list in in Dec15-2014-MSDN-File_List-en-US-en-GB.txt

MSDN File List:
en-gb_windows_8.1_enterprise_n_with_update_x64_dvd_6050232.iso
en-gb_windows_8.1_enterprise_n_with_update_x86_dvd_6050226.iso
en-gb_windows_8.1_enterprise_with_update_x64_dvd_6054383.iso
en-gb_windows_8.1_enterprise_with_update_x86_dvd_6050720.iso
en-gb_windows_8.1_n_with_update_x64_dvd_6051680.iso
en-gb_windows_8.1_n_with_update_x86_dvd_6051705.iso
en-gb_windows_8.1_pro_n_vl_with_update_x64_dvd_6050975.iso
en-gb_windows_8.1_pro_n_vl_with_update_x86_dvd_6051133.iso
en-gb_windows_8.1_pro_vl_with_update_x64_dvd_6050881.iso
en-gb_windows_8.1_pro_vl_with_update_x86_dvd_6050919.iso
en-gb_windows_8.1_with_update_x64_dvd_6051481.iso
en-gb_windows_8.1_with_update_x86_dvd_6051555.iso
en-gb_windows_embedded_8.1_industry_enterprise_with_update_x64_dvd_6052165.iso
en-gb_windows_embedded_8.1_industry_enterprise_with_update_x86_dvd_6052254.iso
en-gb_windows_embedded_8.1_industry_pro_with_update_x64_dvd_6052087.iso
en-gb_windows_embedded_8.1_industry_pro_with_update_x86_dvd_6052124.iso
en_windows_8.1_enterprise_n_with_update_x64_dvd_6050225.iso
en_windows_8.1_enterprise_n_with_update_x86_dvd_6050217.iso
en_windows_8.1_enterprise_with_update_x64_dvd_6054382.iso
en_windows_8.1_enterprise_with_update_x86_dvd_6050710.iso
en_windows_8.1_n_with_update_x64_dvd_6051677.iso
en_windows_8.1_n_with_update_x86_dvd_6051704.iso
en_windows_8.1_pro_n_vl_with_update_x64_dvd_6050969.iso
en_windows_8.1_pro_n_vl_with_update_x86_dvd_6051127.iso
en_windows_8.1_pro_vl_with_update_x64_dvd_6050880.iso
en_windows_8.1_pro_vl_with_update_x86_dvd_6050918.iso
en_windows_8.1_with_update_x64_dvd_6051480.iso
en_windows_8.1_with_update_x86_dvd_6051550.iso
en_windows_embedded_8.1_industry_enterprise_with_update_x64_dvd_6052160.iso
en_windows_embedded_8.1_industry_enterprise_with_update_x86_dvd_6052252.iso
en_windows_embedded_8.1_industry_pro_with_update_x64_dvd_6052086.iso
en_windows_embedded_8.1_industry_pro_with_update_x86_dvd_6052123.iso
en_windows_server_2012_r2_essentials_with_update_x64_dvd_6052824.iso
en_windows_server_2012_r2_vl_with_update_x64_dvd_6052766.iso
en_windows_server_2012_r2_with_update_x64_dvd_6052708.iso
en_windows_storage_server_2012_r2_windows_server_2012_r2_foundation_with_update_x64_dvd_6052810.iso

Enjoy,
murph