User blog comment:Imperial-Dovahkiin/Help!/@comment-6030543-20130206004243

It's not that complex, just download the files, extract them, and then move them to your Program Files > Steam > steamapps > common > Terraria. Then bamm, you're done. Then install the GameLauncher for Terraria, install that, and launch N Terraria via GameLauncher. GameLauncher starts by playing Terraria as you normally would. Hope I helped a little bit...