I was using Blender last night, and there’s a number of display settings that need changing or enabling / disabling to get the render to display how you intend. I was having trouble with a simple model I made, in which I went to render it and it appeared completely white with hardly any shadowing or detail at all. When opening the model in Blender, at the right is a bunch of sidebar tabs (similar to details panel in Unreal but way more stuff). Try changing the settings in there, then go up to the top bar (File, Edit…etc) and select Render Image under the Render dropdown. It’s a refresh of the image / model with current settings. It may also be the Viewport Shading method (upper right just inside viewport, so may need to drag the sidebar border to the left for it to be visible) is set to the wrong type. I have “Display in Solid Mode” selected, whereas if I change it to “Look Dev” or “Render Preview”, it doesn’t apply all the settings I have set (such as Metallic).
When exporting from Blender, the forward axis and up axis need to be changed from the Blender defaults. I think Unreal is x-axis forward (or y-axis forward if it’s not that), and z-axis up, but not any of the negative xyz axes in the list of the export options. If it’s exported with the defaults, then it’s probably going to appear with the UV texturing and such in the wrong positions, and normals in the wrong axes. That’s how it appears the model is rendering in Unreal in the photo where it is messed up, with UVs flipped / mirrored / rotated oddly. I couldn’t unzip that .rar file yet because I need to download a free unzipping program and then be able to open it in Unreal 4.23.1.
Have you tried contacting the original designer of the model about this problem?