The page has been broken for some time, and due to an ongoing rewrite of the entire website, it probably won't be fixed any time soon.
You can still try to download mod or modpack support, but remember that the site may not work, and we probably cannot help you in troubleshooting.
Download All Textures for Version
Put Together Your Own Pack
The versions you have selected are not compatible
Please select the packs you want with a matching pack version first