Doxywizard 1.8.7 and its library dependencies were built with a deployment target of 10.9:
$ otool -l Doxygen.app/Contents/MacOS/Doxywizard | fgrep --after-context=3 LC_VERSION_MIN
cmd LC_VERSION_MIN_MACOSX
cmdsize 16
version 10.9
sdk 10.9
This means the application can only be run on a system running OS X 10.9 or later. Either support for older operating systems was removed in this release or the binaries were accidentally built with an incorrect deployment target.