Since Terraria is a paid title developed by , downloading it for free from unofficial sources is not recommended for several reasons:
The pursuit of this specific version on PC often stems from the modding community. Terraria boasts one of the most dedicated modding scenes in gaming, largely centered around the tModLoader application. For a long period, tModLoader was officially locked to version 1.4.0.5 while the developers of the loader worked to update their framework for newer patches. Consequently, players seeking to play massive content mods like Calamity or Thorium during that interim period specifically sought out the 1.4.0.5 files. In this context, the desire to download this specific version is not about piracy, but about compatibility and the desire to experience the vast library of user-generated content that defines Terraria’s longevity.
Black Slimes and Blue Jellyfish were added to Hardmode to ensure players could always finish their Bestiary entries.
Let’s repeat that: The PC received Journey’s End as version 1.4.0.1 on May 16, 2020. Subsequent hotfixes were 1.4.0.2, 1.4.0.3, 1.4.0.4, and 1.4.0.5 — but that last one was for mobile and console only. The latest PC version today is 1.4.4.9 (Labor of Love update).