Sorry, I misread Da Man's post. I thought they were asking to *not* download existing chapters--I interpreted 'updated' as 'added'.
Unfortunately, there's no universal way (and no way at all on ffnet) to detect when existing chapters have been changed.
The least-steps way to handle that case is to download in Overwrite Always mode.
The least-network-traffic way is, as ownedbycats suggests, to delete the chapters that have changed before updating EPUB.
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