I installed Kepler on Windows 10 with Java 6.
I copied the Manufacturing Tool Jar into the Java downloads plugins directory. I copied the entire plugins directory to the C/C++ Eclipse plugins directory. The Java plugins seem fine.
The Manufacturing Tool appears in the Help, About, Installation Details, Plugins. It is unsigned, and there is no Provider entry.
When I select File, New, Other, there is no Manufacturing Tool listed under Select A Wizard. There are Java wizards, and C/C++ Wizards.
I deleted .metadata as the instructions say, but every time eclipse is started, the directory is re-created.
According to this, Java 6 is recommended for Kepler:
https://wiki.eclipse.org/Eclipse/Installation#Eclipse_4.3_.28Kepler.29
According to the manufacturing tool, it can use Eclipse 3.7, 4.2, and 4.3 (Kepler).