It seems to be an outdated version however. When using that script i’m getting the warning "CKEditor version 3.0 is installed, this plugin would prefer the version 3.6.5. Please first uninstall this version.”
The message doesn’t tell me where to get version 3.6.5 and I can’t find that new version.
you already have an installation of ckeditor in /lib/
You only have to remove /lib/ckeditor and return to the plugin configuration page. Then SPIP will download and install automatically the required version of ckeditor.