@King of Worms: Thanks for your reply on the other thread. I just tried this download link and installed it like the instructions said. Most of the textures are working, although I did find a few bugs. Some of the terrain flats were floating in the air when I found them (see image below), one of the terrain flats did not change initially because the filename for the image had two dashes in it instead of one (the image I am referring to is "505_28-0.png". Originally there were two dashes which prevented the new texture from loading). That, and I don't see any of the ground textures in the biomes that I think were added. I looked at the roads in particular in desert areas, although I may be looking in the wrong place.
Don't get me wrong though, thank you for putting this work into the game. I know it's not finished yet, I just wanted to offer the results of a (very) quick test I did.
EDIT: I just found some of the new ground textures, so I think they're fine actually. I just wasn't looking during the right biome (non-winter). Again, thanks for the contributions form everyone involved.