This feature is available in version 1.2.0 or any later version.
Upgrade Phoca Guestbook:
- Extensions » Install/Uninstall. Now you are in Extensions Manager. Click on Upload Package File - select the Phoca Guestbook component ZIP file from your disc and click on Upload File & Install.
Then you can choose between install or upgrade Phoca Guestbook component. Select upgrade. If you select install, all old data will be removed.