You also want to make sure the official DLC you have purchased isn't something so recently released that the Toolkit hasn't been updated to allow you to change the AppID. Most of us that pre-purchased RS2014 got the CherubRock as a free dlc, so that is what most of us use. It might be worth buying CherubRock just so that you don't have to mess with learning how to change the AppID in the Toolkit (although that is definitely a core skill you want to develop). How do you change the AppID in the Toolkit?