Subscribe and get Free PDF products with the same Email address

Hi, I’m new here :)

I need help with the app. I have an online store offering 5 free PDF products. I want a signup form on each product page so visitors can enter their email and get the PDF via email.

The problem is, if a visitor subscribes once and gets a PDF, they can't get another PDF with the same email from a different product page.

How can I set it up so visitors can use the same email to get different PDFs from different product pages?

Thanks in advance :)