If PBR textures don't seem to work for you, then it probably hasn't been added to EBE yet, or maybe it's bugged, try posting it as a possible bug on github.
There is no displacement texture in gameguru, these are the textures that gameguru uses:
_gloss (this is actually a _roughness but renamed to _gloss)
_illumination or _emission (if used will override the _detail map)
_height (height map, probably closest to displacement we have, however the last i heard Lee said he hadn't connected it up yet)
_D (your base colour/texture map)
_N (your normal map)
_S (your specular map)
_I (that's an uppercase i, not a lowercase L. your illumination map)
i7 7700,k NV1070 8GB, 16GB 3200mhz memory, 1x 2TB Hybrid, Win10.
i5 4760k, NV960 2GB, 16GB 2333mhz memory, 1x 2TB Hybrid, Win10.
i3, Intel 4000 series graphics, 6GB memory, 1x 500gb HDD, Win8.1.