I've no idea if Conservative's tool still works. I've never needed it.
It works and it doesn't, you have to manually edit one of the main python files to change the search directory for the brick textures to your Blockland's directory, and in versions of Blender that are newer than the one the plugin was made in, random faces of imported BLB/BLS files will be flipped and the UV mesh for bricks that use the bottom-edge texture will be distorted due to the vertices of the UV mesh being in incorrect places