You can't directly "download" the default Minecraft texture pack as a separate file from official sources, because the default textures are built into the game's JAR file. However, you can them or download a community-provided copy.
{ "pack": { "pack_format": 3, "description": "Default 1.8.9 Textures" } } Minecraft will fall back to built-in textures for missing files. Only download from trusted sources. Many fake "default pack" downloads contain malware. The extraction method is always safest. download minecraft default texture pack 1.8.9