Yes, but carefully. The official mod loader, tModLoader, is a free DLC on Steam. Currently, tModLoader has two branches:
If you want to play Calamity Mod with the latest Terraria features, you cannot yet use 1.4.4.9. Calamity is still on 1.4.3.6. However, small QoL mods (like Magic Storage or Recipe Browser) are being updated daily for 1.4.4.9. terraria pc 1.4.4.9 download
To install tModLoader: Steam → Store → Search "tModLoader" → Add to account (free). It will appear as a separate game in your library. You can then choose which version of Terraria to launch. Yes, but carefully
A: Usually yes. Terraria is famous for forward compatibility. However, back up your worlds before updating. Some modded items may vanish. If you want to play Calamity Mod with
First, let us clear up the version numbers. Many players search for Terraria PC 1.4.4.9 download because they want the final stable build before the major 1.4.5 update (which is still in development as of this writing).
Why is 1.4.4.9 important? It is the most stable, bug-free version of the “Labor of Love” update. For modded players (using tModLoader), 1.4.4.9 is often the required base version for popular mods like Calamity or Thorium until those mods update to 1.4.5.