A .wup file is essentially a decrypted or encrypted dump of a Wii U title (game, update, or DLC). It contains the game files, meta data, and code content. Unlike the Loadiine format (which extracts files into folders), the WUP format is designed to be installed directly onto the console's NAND or an external hard drive, appearing on the system menu as if it were a legitimate digital purchase.
: You need a folder containing .app , .h3 , .tik , .tmd , and .cert files.
The install will take roughly 10–20 minutes, depending on your SD card speed. The progress bar will tick from 0 to 100. Once finished, press to exit.