You have to restart Emergency 4 when you want to play another mod. You can only load one mod at the same time! You can load mods in the Modifications screen after you have started Emergency 4. This means you only have to add files to your mod which have been changed for your mod. When you load a mod, all files in the mod folder will be loaded, possibly overwriting files from the Data folder.
When you start Emergency 4, files in the Data folder will be loaded. Unpacked and installed Emergency 4 mods can be found in your '~/Emergency 4/Mods/' folder.Įach mod has its own folder and the content of that folder will look similar to the content of the Emergency 4/Data folder. You will learn much more from that than reading tutorials or asking questions. You can compare your mod with other mods or even the Data folder to learn how a mod is build up. You have to put time in understanding every aspect. By reading tutorials you won't learn everything about modding, because it's not possible to explain every detail in tutorials.