I think there is chances to get it from NUS Downloader, but I honestly have no idea how to get it in the first place.
That being said, this is not something that could be asked since it is copyrighted Nintendo files, and while it my have slipped by 6 years ago, this thread shouldn't actually have been allowed due to requesting the files in question.
I will lock this one to prevent any confusion, if you want to ask about how to get the IOS files by yourself feel free to create a new thread.