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I did everything anew.
Reinstalled the 4.6.3. Sigil plugin with modified json file, managed (one hour +) to download epubcheck 5.1.0 from github and extracted it within the plugin folder.
It works when I launch it on the empty new Sigil epub (image 1) but still fails on any other epub2 or 3 (image 2) with exactly the same error message.
I may have something wrong with python.
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