Web Presence Builder is installed on Plesk. However, server-wide backup restoration task completes with a warning:
Unable to find the Web Presence Builder restoration utility to restore Web Presence Builder data. Web Presence Builder is probably not installed. It will be unavailable for the following objects: Server settings
This is Plesk bug with ID PPPM-9127 which will be fixed in future Plesk updates.
The warning can be safely ignored.