Hi! I’m not sure if this email address is the best way to report the issue (I found it when trying to “improve this page” using the link in the upper right corner), but FYI: the Apache Jena Releases page [1] links to SHA512 files for the downloads, but those files don’t actually exist; instead, according to the automatically generated index [2], there are SHA1 files. You might want to change your CGI script to link to those instead.
Best regards, Lucas Werkmeister [1]: https://jena.apache.org/download/index.cgi [2]: https://www.apache.org/dist/jena/binaries/
