Symptoms
Unable to update a plugin or theme on a WordPress instance example.com. The following error is found in /var/log/plesk/panel.log:
Unable to update plugin 'Ultimate' with version 'VC' in WordPress instance
Asset 'Ultimate' with version 'VC' not found in WordPress instance
Cause
WordPress Toolkit cannot update plugin/theme enabled on the WordPress instance that contains underscores “_” in its name, for example:
# plesk ext wp-toolkit –wp-cli -instance-id 101 — plugin list
…
Ultimate_VC_Addons active none 3.19.1
js_composer active none 5.4.7
…
This is WordPress Toolkit extension bug EXTWPTOOLK-4584 that is already fixed in WordPress ToolKit extension v 5.2.
Resolution
Update WordPress ToolKit extension to the latest version.
