Magix tends to force a major version every year so there may not be a v19 update that you can automatically receive.
As @handrawn says, it is probably an update to the Magix Updater.

The Release Notes ought to be flagged here: https://www.xara.com/uk/designer-pro/whats-new/ & http://releasenotes.xara.hosting/designer-pro-x19/ .

As you can read the last update was March 2022 so one might be along fairly soon.

Acorn