A Scribd-Downloader that actually works

index.js

const path = require("path");
const fs = require("fs");
const puppeteer = require("puppeteer-extra").use(require("puppeteer-extra-plugin-stealth")());
const imagesToPdf = require("images-to-pdf");

(async () => {
    const browser = await puppeteer.launch({
        userDataDir: path.join(process.cwd(), "tmp"),
        ignoreHTTPSErrors: true,
        headless: false,
        slowMo: 0,
        args: [
            "--no-sandbox",
            "--disable-dev-shm-usage",
            '--proxy-server="direct://"',
            "--proxy-bypass-list=*"
        ]
    });

    const page = await browser.newPage();
    await page.emulateMediaType("screen");

    console.log("Log in");
    await page.goto("https://www.scribd.com", { waitUntil: "domcontentloaded" });
    await page.waitForSelector(".logged_in", { timeout: 0 });

    // npm start "https://www.scribd.com/read/414178613/How-to-Prepare-for-the-Biology-Olympiad-and-Science-Competitions"
    await page.goto(process.argv[2], { waitUntil: "networkidle2" });

    console.log("Navigate to the first page");
    const pageCounterHandle = await page.$("div.page_counter");
    while ((await pageCounterHandle.evaluate(node => node.innerText)).match("PAGE (\\d+) OF (\\d+)")[1] !== "1") {
        await new Promise(resolve => setTimeout(resolve, 200));
    }

    await pageCounterHandle.dispose();

    let shotCounter = 1;
    const readerHandle = await page.$("#column_container");
    const documentId = await page.evaluate(() => window.Scribd.current_doc.id);
    const outputDir = path.join(process.cwd(), String(documentId));

    if (!fs.existsSync(outputDir)) fs.mkdirSync(outputDir);
    while (await page.evaluate(() => document.querySelector(".epub_banner").getAttribute("aria-hidden") === "true")) {
        while (await page.evaluate(() => document.querySelector(".loading_page").style.display !== "none") || 
            await page.evaluate(() => document.querySelector(".loading_page").style.opacity !== "1")) {
            await new Promise(resolve => setTimeout(resolve, 200));
        } 

        await readerHandle.screenshot({
            path: path.join(outputDir, String(shotCounter) + ".png")
        });

        await page.evaluate(() => document.querySelector("a.page_arrow_link:nth-child(3)").click());
        shotCounter++;
    }

    while (await page.evaluate(() => document.querySelector(".loading_page").style.display !== "none") || 
        await page.evaluate(() => document.querySelector(".loading_page").style.opacity !== "1")) {
        await new Promise(resolve => setTimeout(resolve, 200));
    } 

    await readerHandle.screenshot({
        path: path.join(outputDir, String(shotCounter) + ".png")
    });

    await readerHandle.dispose();
    await page.close();
    await browser.close();

    console.log("Done. Rendering PDF...");
    await imagesToPdf(
        [...Array(shotCounter).keys()].map(x => x + 1).map(cnt => path.join(outputDir, String(cnt) + ".png")),
        path.join(outputDir, String(documentId) + ".pdf")
    );
})();

package.json

{
  "name": "Scribd-Downloader",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js"
  },
  "keywords": [],
  "author": "@limitedeternity",
  "license": "MIT",
  "engines": {
    "node": ">=12.2.0 <14",
    "npm": "7.8.0"
  },
  "dependencies": {
    "images-to-pdf": "^1.0.3",
    "puppeteer": "^8.0.0",
    "puppeteer-extra": "^3.1.18",
    "puppeteer-extra-plugin-stealth": "^2.7.6"
  }
}

Hello, thanks for sharing this. Could you please convert it to a Greasy Fork user script and post it on greasyfork.org?