I am quoting this from another site...
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1) Download and extract the new DiscU: https://twitter.com/crediar/status/791775642949914624
2) Run DiscU.exe path\to\game.key path\to\game.wud c
3) After it's done extracting, go into the folder that was just generated (WUP-P-AL5P in my case) and find the first "GM" folder which holds the game data. Proceed to copy all the files in this directory to your SD card in the SD:\Install folder.
4) Go up one directory and enter the system\02...
[GUIDE] Installing games on your WiiU from a .WUD image
"
1) Download and extract the new DiscU: https://twitter.com/crediar/status/791775642949914624
2) Run DiscU.exe path\to\game.key path\to\game.wud c
3) After it's done extracting, go into the folder that was just generated (WUP-P-AL5P in my case) and find the first "GM" folder which holds the game data. Proceed to copy all the files in this directory to your SD card in the SD:\Install folder.
4) Go up one directory and enter the system\02...
[GUIDE] Installing games on your WiiU from a .WUD image
