Have tested trunk 698 against all the current server operating systems.
It failed in exactly the same way under W2K8R2, W2k12 R2 and W2K12 core versions.
I can't attach a logfile - I get the extension is not allowed.
The install of Dot Net 4.6 definitely starts in gui mode and crashes
Your command is the following:
NDP46-KB3045557-x86-x64-AllOS-ENU.exe /passive /norestart /lcid 1033
The crash is expected with the passive switch, as that is gui mode.
I manually tested the following:
NDP46-KB3045557-x86-x64-AllOS-ENU.exe /quiet /norestart /lcid 1033
This works correctly and displays no gui installer..
Hope this helps to polish your excellent application
regards
Robert