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Script meant for Ungoogled Chromium, but may be used with any browser to directly download Chrome Extensions from Chrome Web Store.
// ==UserScript==
// @name Download Extension from Chrome Web Store
// @namespace laniusone
// @match https://chrome.google.com/webstore/detail/*/*
// @grant none
// @icon https://www.chromium.org/_/rsrc/1354323194313/favicon.ico
// @version 1.0
// @author laniusone
// @license BSD-3-Clause
// @description Script meant for Ungoogled Chromium, but may be used with any browser to directly download Chrome Extensions from Chrome Web Store.
// ==/UserScript==
let bookmarklet = function () {location.href='https://clients2.google.com/service/update2/crx?response=redirect&acceptformat=crx2,crx3&prodversion='+(navigator.appVersion.match(/Chrome\/(\S+)/)[1])+'&x=id%'+'3D'+(document.querySelector('a[href^="https://chrome.google.com/webstore/report/"]').pathname.match(/[^\/]+\/*$/)[0])+'%'+'26installsource%'+'3Dondemand%'+'26uc';};
button = document.createElement('button');
button.type = 'button;'
button.style.cssText = 'position: fixed; z-index: 9999; bottom: 2%; right: 2%; padding: 10px; color: white; background-color: blue; text-decoration: none;';
button.onclick = bookmarklet;
button.innerText = '+';
button.id = 'custom-extension-download';
document.body.appendChild(button);