A deep dive into the game's design and art.
This specific patch addressed several community-reported issues from the 3.4 release:
If you own the game on Steam, ensure your "Automatic Updates" are enabled to download the latest stable version.
To specifically play v3.4.2 , right-click Stellaris in your Steam library, go to Properties > Betas , and select 3.4.2 - Cepheus from the dropdown menu.