Terraria version 1.4.4.9 is a minor patch focusing on stability and bug fixes, including all "Labor of Love" content, such as the Shellphone and Terraformer [Terraria, Steam]. The ~580 MB file represents the compressed PC version, which is best obtained through official channels like Steam or GOG to ensure safety [Steam, GOG].

For a full changelog of this patch, you can visit the official Terraria Wiki.