February 18
Created a new Project (DMD + LDC) with VS 2015

Debug x64
→ LINK : fatal error LNK1104: cannot open file 'phobos64.lib'
→ Building Debug DMD x64\a.exe failed!

Debug x86
→ LINK : fatal error LNK1181: cannot open input file "Debug DMD Win32\a.obj,Debug DMD Win32\a.exe,Debug DMD Win32\a.map,user32.lib+"
→ Building Debug DMD Win32\a.exe failed!
February 18
Solved :)

The installer does not update the DMD-Path, when it has already been set in Visual Studio. That is a problem if you install DMD to a different directory and update Visual-D.