There is no “original English” version.
However, the short answer is , but with a major caveat: You cannot download it for free as a single PDF file. Codex Gigas Full Book English Translation
Unlocking the Devil’s Library: Is There a Codex Gigas Full Book English Translation? There is no “original English” version
codex-gigas-english-translation
They can’t.
This is the —Latin for "Giant Book."
(Historians, of course, note that handwriting analysis proves only one scribe wrote it, likely over 20–30 years—but the legend is far more fun.) Here is the honest truth. the short answer is