We do not link the epubcheck plugin on the Releases page because it is not our (Sigil-Ebook) plugin! We did not develop it nor do we maintain it. All the credit for that goes to Doitsu. It is Doitsu's plugin!
It is in the plugin index so that people can find it.
I truly expect to see almost all epub publishing moving away from epub2 to epub3 given its importance overseas, especially in Japan and Asian markets. So flightcrew's future usefulness is in question.
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