Have you tried simply adding the epub to Sigil. I have long ago modified Sigil to force uniqueness of file names upon first import. So Recent versions of Sigil should not lose any links or things on import when loading a book like that.
Please give it a try with the most recent version of Sigil and let me kniw what happens.
Last edited by KevinH; 10-05-2017 at 03:08 PM.
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