You do not need update everyone to the latest version. You only need upgrade server side installation (one upgrade).  You can follow steps:

 

1. Backup your website

2. Download CuteEditor for .NET,download Url is http://cutesoft.net/downloads/folders/cute_editor_current_releases/entry21904.aspx

3. Unizip the download package

4. Install the latest version to your server (http://www.cutesoft.net/ASP.NET+WYSIWYG+Editor/Deployment/html-editor-Deployment/Deployment.htm)

5. Switch and use the latest version

6. Remove old version installation.

 

Regards,

Eric