Please follow steps:
1. Backup your website

2. Remove folder "CuteSoft_Client"

3. Download cuteeditor for .net, download link: http://cutesoft.net/downloads/folders/cute_editor_current_releases/entry21904.aspx
4. Unzip it
5. Upload files of folder "\Framework 2.0\bin" to your application bin folder, it will override your previous files with same name.
6. Upload folder "CuteSoft_Client" and all file it contains to http://{your site}/{your application}/ on your web site
7. Migrate your customization of old version to latest version

8. Copy the permanent license to "bin", you can find the permanent license from your backup, license file name is "cuteeditor.lic"

9. Test it