I try to sell epubs with Paid Download. The download links look fine and the downloaded file has the right size. But ebook programs (nor Calibre nor fbreader or Sigil) can’t read it. When I try to unzip the epub (epubs are zipfiles) I get this answer:
$ unzip annII.epub
Archive: annII.epub
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of annII.epub or
annII.epub.zip, and cannot find annII.epub.ZIP, period.
$
