Microsoft has removed the manual download links for the x86 and x64 files for its new Windows 8.1 August update, a few days after they went live, thanks to two bugs that have been discovered since they were released.
Microsoft added a few new features and improvements to Windows 8.1 in this latest update, including some additional touchpad functions, some new APIs that will enable OEMs to add Miracast support and more. However, the support page for the August update does show two known issues with this update: "fonts do not render correctly" and "systems may crash with a 0x50 Stop error message (bugcheck)." As a result, the support page says, "Microsoft has removed the download links to these updates while these issues are being investigated."
It's unknown if the automatic updates for these files have also been halted.