I didn't see an EPUB, so I made one from the Vatican HTML: TOC + footnotes, passes epubcheck.
https://github.com/n2ctech/magnifica-humanitas-epub/releases...
https://github.com/n2ctech/magnifica-humanitas-epub/releases...
Codex helped write the converter, but the EPUB text is parsed from the Vatican HTML. The script doesn’t rewrite or summarize anything; it just repackages the source into EPUB with TOC, footnotes, metadata, and cover.
v1.1 has both EN/FR EPUBs.