[DiapDealer]

Try this version with your Sigil 1.1 (no point in testing it by launching via your version of calibre; nothing was changed in that regard).

The plugin won't be able to match Sigil's highdpi settings, dark mode / light mode settings, or Sigil's ui font until you upgrade to at least Sigil 1.2, but it should at least function.

EDIT: removed beta attachment as it's now been incorporated into the official release on the first page of the thread.