Download

Unreal Engine 4 - How to convert any online texture into a proper material

https://www.youtube.com/watch?v=WdPVjtQHwIo

Please don’t do that!

Grayscaled Diffuse Maps shouldn’t be used as an input for Normal Maps.
Instead, create your own Heightmap first.

Grayscaled Diffuse Map:

Correct Heigth Map