So if you want to use the Ajax Upload Multiple Attachments Plugin version, download the plug in, Unzip the files to directory
1. Open the jScripts folder and find a file named myproattach.js.
2. Open it in a text editor
3. Find and replace ann instances of $('#message').sceditor('instance').insertText with CKEDITOR.instances['message'].insertText
4. Save the changes
5. Upload the file (If you already using the plugin, replace the file inside the jscript folder).
Reload the page and try, it should work.