Edit the ScreamAPI.ini file to list the AppIDs of the DLCs you want to unlock. Why Players Use It
If you have a DLC file pack, extract it into the main Cities: Skylines folder. The folders should merge (e.g., Files\Mods\ and Files\Scenarios\ ). The critical part: ensure that Files\Steam\steam_api64.dll is overwritten yet. screamapi cities skylines