Windows 8 AIO 3in1 x64 Oct15 2012|3.98 GB
There are no well established activation bypasses as of yet, so I have not included them.
Sources:
MICROSOFT.WINDOWS.8.PROFESSIONAL.RTM.X64.ENGLISH.DVD-WZT,
MICROSOFT.WINDOWS.8.ENTERPRISE.RTM.X64.VOLUME.ENGLISH.DVD-WZT
This 64-bit RTM is Build 9200...