What is it exactly? You've probably got the wrong format of game to install with WUP Installer because normally you will see small files broken down into small pieces called .app files. There shouldn't be anything over 4 gb in a single file.
You could tell me what it is then I can probably tell you the right place to get the correct file type. Is it a Wii U game? If so google "reddit Wii U Usb Helper workaround" and follow the instructions, you can download practically all Wii U games using that program and they work with Wup Installer to install to a hard drive or internal.