Hey,
The map should come with a HOF, but in another bus folder.
If you open your map download and go into your vehicles folder, you can copy the HOF from the Enviro 200 MMC folder and then put it in your E200 folder. Note that if you are on about the non-MMC Enviro 200, you will also need to make displays for them to show as they won't work like normal LEDs.