On September 15, 2014 – Microsoft made the fourth release of Windows ADK 8.1 available. As usual without any explanation on what's been changed 🙂
Windows ADK 8.1 history
First release, September 2013: 2.79 GB in size
Initial release, contained ACT 6.0, WinPE 5.0, and USMT 6.3
Second release, October 2013: 2.85 GB in size, subversion 8.100.26020 (Patches folder)
No new versions, just bug fixes.
Third release, April 2014: 2.97 GB in size, subversion 8.100.26629 (Patches folder)
In this release ACT was updated to 6.1, and a package to update WinPE to 5.1 was made available. The other updates was basically bug fixes.
Fourth release, September 2014: 2.97 GB in size, subversion 8.100.26866 (Patches folder)
Bug fix for dism and updates to the documentation (EULAs). Still ACT 6.1 and WinPE 5.0 with WinPE 5.1 update option.
In addition to dism to following deployment components had new versions, but I have not yet learned if its just artifacts of the build process, or if they contain any updates.
Imagex.exe: updated to 6.3.9600.17095
wdsmcast.exe: updated to 6.3.9600.17237
USMT: (all tools) are updated to 6.3.9600.17237
Download the fourth release
For an offline download, simply download the adksetup.exe file to a temporary location, and run adksetup.exe /layout C:tmpofflineADK81.
Upgrading to the September 2014 release of Windows ADK 8.1
To upgrade to the latest version, run adksetup, and run through the setup wizard.