Place the 00_mocha.rpx from Mocha in the sd:/wiiu/environments/installer/modules/setup folder.
Place the 90_launch_installer.rpx from the LaunchInstaller in the sd:/wiiu/environments/installer/modules/setup folder.
Place the PayloadLoaderInstaller.wuhb from the PayloadLoaderInstaller) in the sd:/wiiu/apps/ folder.
Copy all files on the sd card and launch then Environment via the EnvironmentLoader. Press X while launching to force open the environment selection menu.
After launching the environment, the PayloadLoaderInstaller should load automatically. Follow the instructions on the screen. See the PayloadLoaderInstaller repository for more information.
Download
A bundle with the latest nightlies can be downloaded here by clicking on "Download all".