These 2 texture packs are *completely* messed up and packaged incorrectly. They are missing the right folder stucture for minecraft texture packs and are therefore not supported by mcresconvert.necron099 wrote: 21st Century-Craft v8.zip http://www.planetminecraft.com/texture_ ... ury-craft/
DefaultPro-15-v2.zip http://www.planetminecraft.com/texture_pack/defaultpro/
If the texture pack zip file doesn't have an "assets" folder, like these two, it's just guesswork where the texture files are and so mcresconvert can't do anything with these, sorry.