Marco,

Well, that didn't take long, see attached.  (Not that I'm surprised,
given their history.)  Before you update ImageMagick to upstream
6.9.0-9, you'll need to (re)build the current release (or a newer one
prior to 6.9.0-9) and split the DLLs into libMagickCore6_2 (which
OBSOLETES libMagickCore6), libMagickWand6_2, and libMagick++6_3.  The
latter will then become libMagick++6_6 after the 6.9.0-9 version bump.

--
Yaakov