- Plesk for Linux
Wildcard subdomain (or any other additional domain or subdomain, that share Document Root with the main domain of the subscription) removal deletes WordPress instance from main domain.
- #EXTWPTOOLK-2580 " Removing a subdomain in Plesk will not remove WordPress installation anymore if this subdomain’s docroot was pointing to another domain with WordPress installed. This also covers the use of wildcard subdomains. "
If update is not possible for some reason you may try the following