The standalone distribution contains only a binary. All assets and templates (html files, css, js, etc) are included directly in the binary. If you don't intend to modify those assets, this distribution is for you. All you have to do is download the archive, and go the Setup page to read the instructions on how to setup goploader server.
These downloads contain the pre-compiled binary along with all its assets. You're free to modify what you want in those assets. (HTML templates, CSS, JS)