It's a command line tool that is capable of grabbing basically any file Steam has (given you have an account with access to it). It used to be a lot easier, mind you, with just a couple of commands that could be run directly in the Steam console, but they've broken that, so now we need a special tool to get the job done. Steam does still have all the files from basically all versions of a game, even the very very early ones, and those files are downloadable, but they aren't exactly easy to get to. Well, that's what Steam wants you to think, and that's what many do in fact think, but that isn't truly the case. 'But Micael, it's impossible to downgrade a Steam game', you say. That's why I've made this guide, so you can go back to a previous game version while you wait for other things to add support for the new Terraria version. Hello! If you're reading this, I suppose your Terraria just updated by itself, without any warning, and now you can't But I'd suggest taking a look at that tool first.

The old guide is still here, if you want to do it manually. Now there's a tool for doing exactly this, with a nice interface and all: TerrariaDepotDownloader

How_to_manually_downgrade_Terraria_because_Steam_doesnt_care_about_making_it_simple.mp4 Update - there's an easier way!

Terraria 1.2 download pc