Hi there,
I've read your requirements. Let me write a python script that downloads legacy PDF files from an institutional repository. I will make it to download newest files, save the all files in the same directory, make files fully downloaded and continue downloading from the point it stopped.
Ok, it will run everyday. It will download the files of the current day and makes sure the previous ones are correctly downloaded.
I'm in development business for 10+yrs and have done different kinds of projects, including scraping and downloading files.
Please let me know if you have questions
Thank you
Max