Yes, I know you downloaded the epub, but ebook versions of textbooks are tricky, especially if there is a PDF version.
How is it on Pocketbook on Android or iOS? I think it supports ADE.
Kobo also may use an older ADE.
Journals & Textbooks in electronic form are problematic and a rip-off compared to other ebooks.
Quote:
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According to a spreadsheet of costs quoted to university librarians, Manchester University gave a recent example of being quoted £75 for a popular plant biology textbook in print, but £975 for a three-user ebook licence. Meanwhile Learning to Read Mathematics in the Secondary School, a textbook for trainee teachers published by Routledge, was £35.99 in print and £560 for a single user ebook.
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—The Guardian
Also formatting is often problematic on ebook versions of textbooks (PDF has no issues) because epub2 was aimed at novels. Then also the quality of ebook formatting by big publishers is poor compared to paper/PDF versions.