Blender 4.2 and newer. It is tested on Blender 4.2, 4.5 and 5.2 LTS.

Yes. Each span hangs as a true catenary solved from the ruling span of the section, so the sag grows with the span, follows slopes and is shown together with the ground clearance in the panel.

Yes. Every part is a UV-mapped mesh with Principled BSDF materials. Pick the Low detail level, use Convert to Mesh and export as usual (FBX, glTF).

Yes. Select a curve and add the line along it, pick a terrain object so every support stands on the ground, or select your own objects and string wires between them.

Yes. The wood, concrete, rust, gravel and asphalt textures are CC0 textures from Poly Haven, packed inside the addon, so nothing has to be downloaded.