Is Scribens LibreOffice.ext included with the Libreoffice 6.0 download?

I did not see it listed under the Extension Manager and downloaded from the Web. Following the instructions given on the web page it will not install. Am I doing something wrong?

The download link for the LO extension on the Scribens website led me to - it downloaded and installed just fine. If you downloaded it with Internet Explorer, it probably changed the extension to .zip, making it less accessible for the extension manager of LO. I found the interface somewhat cumbersome. On a side note: is it me or does Scribens require that you copy/paste the text that you want to check, into a special edit window?

Wish I knew floris v there is no explanation on the web that I can find.