@kleatus Yes, we understand your error message.
The Yoast\WP\Lib\Model class is located in the /lib/model.php file in the plugin. So, this error suggests that you have an incomplete or otherwise broken copy of the plugin, somehow. You should manually update the plugin using the ZIP file from the site in order to see if that fixes the problem.
In other words, you need to make sure that the plugin is “complete” on the sites where you are getting this error message. If it is a problem with the update process in some way, then that’s generally not under the control of the plugin itself.
WordPress updates plugins the same way every time, the plugins themselves don’t have any say in the matter, so finding out if the upgrade is actually incomplete in some manner is important to solving the underlying issue.