How to upgrade DotNetNuke fckEeditor to version 2.6 :
First you will need to download a copy of the FCKEditor from the web site http://www.fckeditor.net/
After unzipping FCKeditor_2.6.zip file follow these steps:
1) First of all make a copy of currently installed FckEditor for possible needs. You can find it in your DotNetNuke root folder \Providers\HtmlEditorProviders\Fck\FCKeditor
2) Copy the “editor” folder (including all of its contents) from new version into \Providers\HtmlEditorProviders\Fck\FCKeditor\editor of your installed DotNetNuke.
3) Copy fckconfig.js from new version into \Providers\HtmlEditorProviders\Fck\Custom of your installed DotNetNuke then right_click on it and choose “edit” from the list. In this notepad file opened, you must find FCKConfig.ToolbarSets["Default"] and change it to :
FCKConfig.ToolbarSets["DNNDefault"]
4) In \Providers\HtmlEditorProviders\Fck\Custom of your installed DotNetNuke also right_click on fckconfigsecure.js and choose “edit” from the list. In this notepad file opened, you must find FCKConfig.ToolbarSets["Default"] and change it to:
FCKConfig.ToolbarSets["DNNDefault"]
5) Copy the following files from new version into \Providers\HtmlEditorProviders\Fck\FCKeditor of your installed DotNetNuke.
The files are: fckconfig.js , fckpackage.xml , fcktemplates.xml , fckstyles.xml
Now you can browse to your portal and enjoy the new version!