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I downloaded Epubcheck-v4.2.zip from the Github repository, but trying to add it to the Sigil plugins renders: "This is not a valid Sigil plugin". Sigil Version: 0.9.7, Windows 10 32 bit.
The current EpubCheck version that I use is 3.0.9. It works fine.
Supposing that "epubcheck.zip" in post #1 is version 4.2., I downloaded it as well, but with the notice that it couldn't be installed
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