Editor install.js "Given file is not a zip archive"

Hi,

I am following the instructions to install Editor at https://datatables.net/blog/2017-08-31 but when running the "node node_modules...." command in the command window, I get the following error:

Editor NPM install script
  Given file is not a zip archive

The zip file I am using was directly downloaded from https://editor.datatables.net/download/

Any help to solve this will be appreciated

Thanks