If I'm remembering correctly, I extruded out the edges of the window and duplicated that shape to have two layers. In Unity, I animated the UVs so each layer's texture moved opposite to each other and it created a cool effect :)
In blender? because I'm using your game assets to try to recreate the scene (sorry) and you have models for the light shafts and textures for them as well. Were you able to recreate them in Blender, or does it have to be in unity? and any other tips or tutorials to use for the AMAZING environment you have made?
Haha if you managed to rip the assets from the game, I'm sure you will manage to make some light shafts on your own ;p
Also, you asked about the software I use; it shouldn't matter what you use, they all do the same thing.