Just posting to possibly help others with the mistake I made.
I am new to ZenCart and started with a fresh installation of 1.3.9d and then attempted to add CKeditor 3.4 and could not get it to work. I asked for help and no one had an answer.
Here it is.
If you start with a fresh install of ZenCart 1.3.9d, there is a version of CKeditor already installed but does not show up in text edit area.
This means that a new installation of CKeditor on 1.3.9d is an upgrade, even if it is the first thing you ever do to your ZenCart. So just follow the simple directions for an upgrade and copy only two file folders to the ZenCart root directory. The 2 file folders are admin, and editors. Then follow the *(recommended)* instruction about selecting CKeditor as your default editor.
(note) I don't know what version of ZenCart first had CKeditor included.



