JCK Manager: Upgrading - Using Joomla's Installer
If from any reason the update process fails, you still can download the package from this link ( http://www.joomlackeditor.com/downloads/viewcategory/46-jck-suite ) and user Joomla installer upgrade.
Before starting, it is advisable to create a restore points prior to upgrading. This can be done by exporting a backup of your custom configuration as a tar.gz (please see: Backup and Restore for instructions on how to do this).
Go to ‘Extensions’ and click on ‘Extension Manager’. Under `Upload Package File’ click on `Browse...’-> Navigate to the Zip file -> select it -> click `Upload File & Install’.
The system will now automatically update the JCK Suite. Once completed it will inform you that the application has been successfully installed and walk you through an installation wizard.