How to run DefiantCE in Minecraft

Download the DefiantCE compiled Jar file from either the repository's files or from the releases page.

Minecraft launcher/TLauncher: Open your Minecraft versions folder in .minecraft and create a folder. You may rename it to anything you want, but you must remember its name, as it will appear as such in your Minecraft launcher. You can run it from the launcher now.

MultiMC/UltimMC (Cracked MultiMC): Make a new instance of Minecraft 1.8.8. Then go to edit instance, and replace Minecraft.jar with the DefiantCE jar file. You can run the instance to launch DefiantCE.