If EpubSplit fails, assume the EPUB is version 3 without a TOC.NCX file, they're optional in version 3.
According to jackie_w's post all you need do is to open the EPUB in calibre's Edit ToC tool and save it (click OK), that will generate a TOC NCX from the NAV.XHTML (which is mandatory in EPUB3).
BR
Last edited by BetterRed; 01-07-2020 at 05:19 PM.
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