JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can put a download link in the Thank You page if you like. Here's a guide:
1. In the Form Builder, click the "Thank You" button.
2. In the Thank You Message editor, highlight the text and then click the "Insert/edit Link" icon. Enter the URL in the field and then click the "OK" button.
You may also attach a PDF file in the autoresponder so that once the user completed the form, the user will receive an email with a file attachment.
Here's a related article: https://www.jotform.com/blog/237-New-Feature-Attach-Files-to-Autoresponder-Emails
Hope that helps. Thank you.