I bought and started this game on my brother's laptop and put a few hours in. I didn't get past Tarris but I don't want to get to the point I was again. I found a skip Tarris mod but don't know if I can (or how to) install it when it is a steam game
Any help, because the mod desription offers none
Please, you give me too little credit - Zapp Brannigan
You install exactly as you would install the mod in the retail version of the game, with the exception of the install directory. All games in Steam are install in the Steam directory, found in C:\Program Files\Steam\steamapps\common by default. Just run the mod installer (I'm assuming this is the Super Skip Taris mod, which has its own installer) and make sure it points at the KotOR directory within the steamapps\common directory.