The Actions are organized in Repositories. Over this repository you get updates dedicated for single tasks.

You reach this page over "Task Management" (1) in Workflow Designer configuration.

After you open this page, please press "Update Repositories" (2), which fetch latest information from Repositories.

When there are new, or old uninstalled special, tasks, you will see an "Install" (3) or for updates an "Update" Button.

This is also done automatically on every Workflow Designer update.