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You would need to upload the file to the Media Library and then set its URL as the link destination. Or is the problem elsewhere? Unfortunately, only a PDF is linked under your link.
I fixed link.
I have file uploaded in media.
The link you set currently leads to pages not protected with SSL. So http:// at the beginning. But your page is running with https:// – so with SSL. Therefore all modern browsers block the download of the file, because it is potentially insecure (from a SSL protected page it links to a non SSL protected page).
Solution: change the link from http:// to https:// at the beginning of the URL.
Glad if I could help. You are welcome to set the topic to solved.