I got it as an NSP file installed with GldleafHow did you purchase SSBU? Is it in cart form, or is it linked to a Nintendo account?
That's a copy of an original, then. There's no way you can run that on OFW. You're going to have to go back to where you (hopefully) extracted it from and use the original media. If you've pirated that copy, then there ain't nothing you can do.I got it as an NSP file installed with Gldleaf