Either use FTPiiu to manually delete the files from the usb or reformat the stick and redownload the game. It's a fool's errand anyway because you'll probably run into the same issue.
They made an accout just to ask that question. If only there's some kind of search engine on the internet. I could make one, I think I'll call it Ask Jeeves.
Are you Mark Wahlberg? Why do you hate Asian people? Who's next on your list? George Takei? Also do you do the hand thing that Italians love to do when they're i-rated?
Please direct your hate mail to:
Nintendo Co., Ltd. (11-1 Hokotate-cho, Kamitoba, Minami-ku, Kyoto 601-8501, Japan
The entire wii u library in WUP format is already on Archive. There's also Wii U downloader and Nusspli. The later will do all the work for you, although it'll take awhile. Why jumping though all those hoops?