If you encounter issues:
Common installation methods:
Register map/missions (if required): some mods require editing a config file to add the map name. Follow the readme to add entries to mission lists or map selection files.
Set compatibility:
Launch the game: start Emergency 4, check for the Los Angeles map or mod content in scenarios/custom missions.
Test run: create a new game on the LA map and verify units, textures, and missions load properly.
A mod archive for MOD 315 usually includes:
Some users report a minor hotfix (3.15b). This is optional and fixes a single bug with police helicopter pathing. You can find it on the same ModDB page as a separate file.
Always back up: copy the entire Emergency 4 install folder and your Documents/Emergency 4 save folder before changing anything.