To use the plugin in 4.14 you need to change the lines 53 and 54 in “Metaballs.cpp” from:
MetaBallsBoundBox->AttachParent = RootComponent;
CapsuleComp->AttachParent = RootComponent;
To:
MetaBallsBoundBox->SetupAttachment(RootComponent);
CapsuleComp->SetupAttachment(RootComponent);
After that you just have to recompile from Visual Studio and you’ll be able to use the “Metaballs” actor.
It works in 4.16 too. 