Quote:
Originally Posted by hank3rd
I have been using Calibre to edit or convert both files. The closest I have gotten so far is with the existing ePub using Calibre to edit it.
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You'll need to do the following:
1. Check the epub2 file that you received with the
IDPF validator.
2. Fix all errors and warnings (or have them fixed by the ebook creator).
3. Install
Sigil and the
epub3 plugin.
4. Convert your epub2 book to an epub3 book.