Have no editor in compose window for phplist.
I upgraded to the latest and greatest 3.4.5.
However, doing centos updatedb and searching for ckeditor.js shows no results. I do have a directory /lists/admin/plugins/CKEditorPlugin with folders and files beneath.
Requires the following under settings for plugins, ckeditor plugin:
URL of ckeditor.js: https://cdn.ckeditor.com/4.12.1/full/ckeditor.js
for me it required https not http.