WP Toolkit - No updates shown for old installations

Symptoms

When checking the WP Toolkit interface, no update is recommended for older installations. When running the Check Update task, it reports all are up to date without error.

Description

We have had user reports of some installations not showing any available updates despite being on older versions of WordPress. 

We have reported this incident to the Plesk WP Toolkit Developers for further review. Follow this article to receive an email notification when any updates or solutions are added to this article.

Workaround

Update the installation to the latest version through the WordPress Admin backend.