Gofile_Btn_Download.user.js

// ==UserScript==
// @name         Gofile_Btn_Download
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://gofile.io/d/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=gofile.io
// @grant        GM_addStyle
// ==/UserScript==


var zNode= document.createElement ('div');
zNode.innerHTML = '<button id="myButton" type="button">Download All</button>';

zNode.setAttribute ('id', 'myContainer');
document.body.appendChild (zNode);

// event-listener on the new button
document.getElementById ("myButton").addEventListener (
    "click", ButtonClickAction, false
);

function ButtonClickAction (zEvent) {
    var allElements, thisElement;
    allElements = document.evaluate(
     '//*[@class="dropdown-item"]',
     document,
     null,
     XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
     null);
    for (var i = 0; i < allElements.snapshotLength; i++) {
        thisElement = allElements.snapshotItem(i);
        console.log(thisElement.href);
        window.open(thisElement.href);
    }
}

//--- Style for added elements using CSS.
GM_addStyle ( `
    #myContainer {
        position:               absolute;
        top:                    105px;
        left:                   460px;
        font-size:              18px;
        background:             #3a4047;
        border:                 0.1px outset white;
        z-index:                1100;
    }
    #myButton {
        cursor:                 pointer;
        background:             #3a4047;
        border:                 1px outset #3a4047;
        color: white;
    }
    #myContainer p {
        color:                  red;
        background:             white;
    }
` );