The big problem you face is Apple’s design of iOS itself. Browsers aren’t really the same on mobile devices; downloading files this way feels almost like an afterthought. This is actually a carefully considered position of Apple’s, but it can feel frustrating.
Maybe simply telling the visitor the approximate size of the file would help, along with a note that they won’t see a progress indicator when using mobile devices?
Alternatively, you could try submitting your EPUB to the iBook Store and linking to that…
k
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