are the C++ unreal modules being installed with the engine or you must download them manually?

I am doing a project in school and my teachers are asking if there are any programs we wish to download on all the PC’s in school. I need to know if the modules come seperately or with the engine

If I understand correctly, you wonder if your packaged game will need any other installation/setup/files to work on a different computer?

If so, when packaging you can check the checkbox in Project Settings > Packaging > Include prerequisites installer. That will make sure that when you start your packaged game on a different computer, first the prerequisites to start your game will be installed.