A simple mod installer, has just one option and that is to let you give the user the option to choose custom modules.
You can have max 3 custom modules, everything is explained on the Thread.
Source Code: https://github.com/LouisTheXIV/Simple-Installer-Creator
You can do whatever you want with the source code, you can modify it, redistribute it, it doesn't matter.
Thread: https://forums.civfanatics.com/threads/simple-mod-installer.666933/
You can have max 3 custom modules, everything is explained on the Thread.
Source Code: https://github.com/LouisTheXIV/Simple-Installer-Creator
You can do whatever you want with the source code, you can modify it, redistribute it, it doesn't matter.
Thread: https://forums.civfanatics.com/threads/simple-mod-installer.666933/