MSDaRT 8.0 SP1 is bundled inside MDOP_2013_R2.iso or MDOP_2014.iso under \DaRT\8.0\

Here is the solid technical text for , as part of the Microsoft Desktop Optimization Pack (MDOP). Microsoft Diagnostic and Recovery Toolset (MSDaRT) 8.0 SP1 – All-in-One Technical Summary

8.0 Service Pack 1 (8.0.xxxx.xx) Part of: Microsoft Desktop Optimization Pack (MDOP) 2013 R2 / MDOP 2014 Target OS: Windows 8, Windows 8.1, Windows Server 2012, Windows Server 2012 R2 (x86/x64) Deployment Type: Bootable Windows PE (WinPE 4.0/5.0) image or integrated into Recovery Media