Generally speaking, steam will automatically install and use dlc after purchase, and players only need to enter the game to use DLC. If you buy DLC but don't have DLC content, you can switch back to the steam interface first, then find the city skyline in the library, you can see DLC on the page, then check all the contents of DLC, and finally re-enter the game.
This game is launched by the producer of urban traffic series games and has an out-and-out traffic system. It also enables players to transform the game according to their own game style, which is well balanced with the multi-level and challenging simulation function.