This is specifically what the Digital File Pro tool is designed to do for you. When you use this tool you can have the files located outside of the webroot so that they are secure and use the Download server behavior to have the file downloaded by the browser. As far as getting a feedback page in place there are a couple of ways you can go with that but I think the easiest would be to use the contact form solution pack. This single solution pack would allow the users to leave feedback and also get the feedback emailed to the person of your choice. Here are some links to these products on our site:
Digital File Pro
digital-file-pro/
Contact Form Solution Pack
contact-form/