Got Xenoblade Chronicles to work on emu but not on a Wii

Hey guys, so i got Xenoblade Chronicles downloaded and transferred it over to my SD card via WiiBackupManager, but when i go into WiiFlow (v4.2.1) and start the game it shows a black screen then goes straight back to the Wii Menu. I don't have a USB drive big enough for 6.5gb to fit on, although i do have a external hdd but i don't think its compatible with the Wii.EDIT: I finally got this game to work earlier this morning.