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Since this is a [Q&A site](https://meta.codidact.com/posts/290638/290640?sort=score) and it took me hours to figure out this small detail actually works, here is my working code in the hope this saves future users a lot of fruitless searching:

```js
const { chromium } = require('playwright'); // Use 'playwright' instead of '@playwright/test'

(async () => {
  // Load the saved state
  const state = require('./loggedInState.json'); // Directly require the JSON file

  // Launch the browser with the saved state
  const browser = await chromium.launch({ headless: true });
  const context = await browser.newContext({ storageState: 'loggedInState.json', acceptDownloads: true });
  const page = await context.newPage();

  // Navigate to a protected page (you should already be logged in)
  await page.goto('mylink'); // Replace with your target URL
  console.log('Logged in successfully!');

  await page.route('**/*.pdf', async route => {
    const response = await route.fetch();
    const headers = response.headers();
    headers['content-disposition'] = 'attachment';
    await route.fulfill({
      response,
      headers
    });
  });
  const [download] = await Promise.all([
    page.waitForEvent('download'), 
    page.getByText('pdflinkname').last().click()
  ]);
  await download.saveAs('./downloads/document.pdf');


  await browser.close();
})();

```

Most of it is a funky concoction of [Google AI Overviews](https://search.google/ways-to-search/ai-overviews/) and [Ecosia AI Chat](https://www.ecosia.org/ai-chat) which I'm sure any other answerer could do better, but I thought it was right to at least show something that worked to start off with (I ran this with `node <my-script-name>.js`). Unfortunately I can't share the exact page I was having issues with, as I connected to an intranet (hence `const state = require('./loggedInState.json');`), although the general principle should be the same, i.e: `const browser = await chromium.launch({ headless: true });` NOT `const browser = await chromium.launch({ headless: false });`!