Microsoft is now letting their TechNet and MSDN subscribers download the ISOs for Windows 8.1 Update, along with Windows Server 2012 R2 with Update 1



From Neowin:

Today's ISO file release on TechNet may be one of the last major software downloads for that service. Microsoft announced in 2013 that it would no longer take any new subscribers to TechNet. Current members still have full access to the service until their subscriptions eventually run out.

As we have reported before, Windows 8.1 Update offers a number of tweaks to the OS, especially for people who still use a mouse and keyboard as their main way to control a PC. Microsoft also plans to bring back a version of the Start menu on the desktop UI in yet another future Windows 8.1 update.

  Windows 8.1 Update ISOs now available on Microsoft TechNet and MSDN