Hello, Bigpierre666.
If you open the Launcher, and you have 4.4.0, 4.4.1, or 4.4.2 installed, there should be an ‘Update’ button to update to 4.4.3. If you don’t have a version of 4.4 installed, click the ‘+’ at the top of the launcher to add an Engine slot for it.
Regards,
Jonathan