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someone / No wait download - imslp.org 

// ==UserScript==
// @name        No wait download - imslp.org
// @namespace   Violentmonkey Scripts
// @match       https://imslp.org/*
// @grant       none
// @version     1.0
// @author      someone
// @description no wait when downloading
// @license MIT
// @copyright 2021, someone (https://openuserjs.org/users/someone)
// ==/UserScript==

window.open(document.getElementById("sm_dl_wait").attributes["data-id"].value, '_blank');