Sigil can't open on Mac (txz keeps converting to cpgz and back)

[annako]

Hi there,
I downloaded Sigil for Mac (my Mac OS is High Sierra Ver 10.13.6). It comes as a txz file, but when I try to open it, it duplicates itself as a cpgz file. When I click on the cpgz file, it converts back to a txz file. Trying to unzip it via the Terminal (using either txz or cpgz file) brings up this error:

Archive:  /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz
  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 /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz or
        /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.zip, and cannot find /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.ZIP, period.
Users-MacBook-Air:~ guestacc$ codesign -dvvv Sigil.app
Sigil.app: No such file or directory
Users-MacBook-Air:~ guestacc$ unzip /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.cpgz 
Archive:  /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.cpgz
  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 /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.cpgz or
        /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.cpgz.zip, and cannot find /Users/guestacc/Downloads/Sigil.app-1.9.30-Mac.txz.cpgz.ZIP, period.

How should I install Sigil? I've already tried redownloading it from the main Sigil site 5 times to no avail.

[KevinH]

Your macOS version is old and does not properly support the xz compression. A .txz (ie. .tar.xz) is not a zip archive. You need a more recent unarchive program. A free more recent one is called The Unarchiver available from the mac app store.

See this post for more info:

https://sigil-ebook.com/sigil/tips/#...z-or-txz-files

[annako]

Originally Posted by KevinH

Your macOS version is old and does not properly support the xz compression. A .txz (ie. .tar.xz) is not a zip archive. You need a more recent unarchive program. A free more recent one is called The Unarchiver available from the mac app store.

See this post for more info:

https://sigil-ebook.com/sigil/tips/#...z-or-txz-files

It works! Thank you so much for your fast response. I'm able to open the program and start checking my epubs.