Could you clarify if you are looking for a (like the 70k audiobooks' source text) or if you need help with a technical write-up on how to download large batches of text files?
If a .txt file opens in your browser instead of downloading, you can usually right-click and select "Save As" or press Ctrl+S . Download 70k txt
Security repositories like SecLists on GitHub contain text files with thousands of common credentials and passwords for testing purposes. Could you clarify if you are looking for
You can download massive compressed files (like enwik9.zip ) which contain nearly 1 billion bytes of Wikipedia text data. How to Save/Download .txt Files Download 70k txt