Should i get RDR download?

What will i get out of this?

1. A complete game with storyline just like the original?

2. or is it just a add on like cod zombie mod?

3. does it have anything to do with the original game?

It's the exact same game except you download it.

It's the exact same game except you download it.

S1MSTA

I think he's talking about Undead Nightmare. Which I haven't played, so I can't help.