Following images converted and resized with http://www.aconvert.com/image/

wood_texture.dds cropped (Total Textures - R2 Copyright 3DTotal.com)
wood_texture_specular.dds cropped (Total Textures - R2 Copyright 3DTotal.com)
bricks_diffuse.dds (Total Textures - R2 Copyright 3DTotal.com)
bricks_specular.dds (Total Textures - R2 Copyright 3DTotal.com)
skybox Yokohama converted (http://www.humus.name/index.php?page=Textures&start=0)

Following images converted with gimp

T_16_*.dds (Yughues Free Metal Materials - Unity Asset Store - https://assetstore.unity.com/packages/2d/textures-materials/metals/yughues-free-metal-materials-12949)