PDF download page not found error

I uploaded a number of PDF files for a website, I see them in the media gallery and they are in the correct directory on the server, but when I go to the URL I’m getting a page not found error. I can’t figure out what’s causing the error because the URL should be correct and the file does exist. Anyone know what could be causing this error?

The page I need help with: [log in to see the link]