If you are still playing on v1.3.0 or the broken v1.4.0 launch , you are missing hundreds of items, three bosses (Deerclops, Empress of Light, Queen Slime), and a functional UI.
When 1.4.5 drops, you will be able to update directly. terraria switch nsp update top
A separate, smaller file that patches the base game to the latest version (e.g., v1.4.4.9). If you are still playing on v1