The exporter you are using, seems to have some problems:
First the alpha-channel for the texture with the bricks is wrong. The alpha channel with the bricks is set to transparent whereas it should be opaque.
While this could be controlled with a node setup, the bigger flaw is that the wall consist of two meshes, each with a plane occupying the same space which leads to z-fighting -
leading to artefacts in the final render.
To get to the final render I set up the nodes for alpha channel in cycles like explained in "How to apply textures with alpha channel?"
The problem with z-fighting is described here.
If you need to get this to work, I suggest, you clean up the geometry of the wall (remove the overlapping part, probably needs a fix for the UV-mapping as well) and set up the nodes with transparency to account for the alpha-channel, while excluding the brick texture.