(Here is a real rough and quick overview of how to rip a disc into a WUD file and how to install this WUD file (or another from the internet) back onto your Wii U. To rip a game, you can use a program called wudump , copy the folders into your SD card root as you've done before and run it from the Homebrew Launcher.
Cemu can run games in WUD, WUX, ISO, WAD, and RPX formats. Cemu - Wii U Emulator. Software to emulate Wii U games and applications on PC. System requirements. Windows 7 (x64) or above OpenGL 4.5 or Vulkan 1.1 RAM 4 GB minimum, 8 GB or more recommended Microsoft Visual C 2017 X64 Redistributable vcredist.x64.exe. Graphics card compatibility.