If you are trying to download version 1.13 of the Paper server (often used in gaming), you can find direct links for various versions on GitHub Gist .
To help you download and use the specific files you're looking for, I've broken this down into the most likely interpretations of "EX(13)" and "Paper." Download EX(13) rar
Use the Shortcuts app to "Extract Archive" or download the Zip & RAR File Extractor. 2. Creating a Paper If you are trying to download version 1