Real Hardware

The soft-mod (CFW)

You will need to soft-mod your WiiU with a CFW of your choice. Please follow the guide at https://wiiu.hacks.guide for more information.

Getting the game to your WiiU

Just putting it on your SD card

Your files/WUP will need to be under SD:/install/GameName/*.* so, for example Breath of the Wild will be under something like the following:

SD:/install/Zelda BotW/*.app
                      /*.h3
                      /title.tmd
                      /title.tik
                      /title.cert

SD:/ is the letter assigned to your SD card, so if your SD card is G then it would be G:/

If you need to manually create the install folder, make sure it is all lower case

The game name must contain no unicode/special characters. All ASCII characters and brackets are ok (so like []())

Using USBHelper

USBHelper has a handy "Copy to SD" button built into it, so you don't need to follow the above steps.

*Via FTP

*Via the WiiU Transfer Tool

Installing the game

Just use WUPInstaller GX2 while CFW (Mocha or Haxchi) is active.