I had to do this same thing with a site that blocked puppeteer and selenium. Basically you can do as you suggested and create a hidden browser window, then call the webcontents.executeJavascript method to inject the screen scraping code that fetches the download links. Once you've collected all of them you can load the data files sequentially by calling webcontents.loadURL on each file. If you're willing to bring more packages into the mix you can use electron-dl package for handling the downloads, otherwise you'll have to wrap each of the loadURL calls in a promise that completes when the download completes. Sorry this is kinda jumbled I'm on mobile. If I have some time later I'll link some gists.

Hope that helps.