I'm not exactly sure which remote app you are referring too but I do have a suggestion and it gets good reviews from the customer base that has used it. Here's the link for it.
What happened to the t.v. remote app that was on the note.
This is my 3rd Note device. I started with the Note 3, to the Note 5 and now the Note 9. I can't remember exactly which Note it was, but they use to be equipped with a IR Blaster. I think that it was the Note 5 which had it last, but they discontinued that. The older ones had it. Something else that was taken away.