Upgrading your SMA infrastructure is a multi-task process that includes obtaining the updates or hotfixes, updating the SMA appliances, and updating the client endpoints. Instructions for creating a MySonicWall account and how to register your appliances are also included, if you haven’t already done that.
The SMA 12.4.3 version includes all the bug fixes that are available with 12.4 and above + latest hotfixes.