It seems as if the repository was abandoned.
I did a fork of it and fixed (hopefully) all of the bugs and also included a texture loader into it.
Link to my fork: https://github.com/Chrizey91/RuntimeMeshLoader
Link to my forum post explaining it: https://forums.unrealengine.com/t/free-open-source-plugin-for-loading-meshes-and-textures-during-runtime/228445