In the newest update,Comet and Brummbar are added to the game. Also,the mod system has been improved.You can download mods from workshop now.But,you should better clean the previous mod first to avoid conflicts.
Links:
https://steamcommunity.com/sharedfiles/filedetails/?id=1892988405
https://steamcommunity.com/sharedfiles/filedetails/?id=1893157554