The download page links to checksums at http://www.freedos.org/download/verify.txt -- but since this page isn't available over https, there's no way to confirm the validity of the checksums, since the page could be intercepted and modified by a man-in-the-middle attacker (https://en.wikipedia.org/wiki/Man-in-the-middle_attack).
As free secure https certficates are now offered by Let's Encrypt (https://letsencrypt.org/), it may be advisable to get https set up for www.freedos.org.
Alternatively, as I see your hosted on Amazon Web Services, if you're using Elastic Load Balancing or Amazon CloudFront, Amazon's Certificate Manager also offers free https certificates.
Let me know if I can be of any help.
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