basically u have to redownload and play through killer chat again (if u deleted it), (and download the dlc aswell) , make sure to unzip both folders or it wont work, once u unzip make sure to minimize and split screen the folders, (both the original killer chat and the new dlc) once unzipped, then hold left click to bring it into the 'game' folder , once u did all that i think you have to re complete the original so when you click overkill on the loading screen and it brings u to saves click on auto saves and click on the very last one n that should work