[from another discussion thread]
IRS link with all current files, should be over 2,000 listed as of tax year 2017.
https://apps.irs.gov/app/picklist/list/ ... tions.html
change view to 200 at a time, so that's over ten web pages you have to wade through, repeating the process ten or more times
Find a suitable downloader add-on for Firefox Quantum:
Download Star https://addons.mozilla.org/en-US/firefo ... load-star/
Filter the download for only "Document" files (PDF links), and click download to grab all 200 files on the page in a batch. Repeat for each page until all files downloaded.