Make sure to remember that even mods updated to 1.4 won't work perfectly, because the build of tModLoader being used is old, an alpha, and still actively in development. You'll naturally need Terraria 1.4 to use this, and you'll need to find working mods to use. You actually access the alpha as a fork of the tModLoader build available on Steam, and through Steam's 'beta build' function, you can opt to download the tModLoader 1.4 public alpha. It's only 'available' on the tModLoader Discord in the sense that the instructions for how to access the alpha are on the Discord. However, if you can't wait or simply don't mind a buggy, usntable experience with limited mod support, you can download the tModLoader 1.4 alpha right now. Related: Can You Play Minecraft On Steam Deck? Java and Bedrock? Terraria's tModLoader situation is very similar.

In the Minecraft world, OptiFine updates don't usually come that quickly, leaving many with no choice but to either stay on an older version of Minecraft or live without mods until the latest version of OptiFine drops. All mods flow through tModLoader, like Minecraft Java mods, for a long time, flowed through OptiFine. In recent years, Terraria modding has been dominated by tModLoader, a modding client that has been officially endorsed by Terraria developer Re-Logic. Related: Biggest Features of Minecraft 1.19: The Wild Update

tConfig, for example, was a popular tool for Terraria 1.1.2. Mods are tied to a specific modding client, and over the years, different modding clients have been popular.

Terraria doesn't work like this, and it instead works a lot closer to modding on Minecraft Java. Many games, like Bethesda games, that support mods have different options of mod loader you can use to organize your mods, but mods are mods and can be installed with any mod loader. First, you need to understand how Terraria modding works, which is somewhat unique for a modding scene.

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