Obvious problems with patch

[Blueshadows18007]

Now I know that this problem as probably been answered before, but I don't have the time or patents to find someone else with a siduation identical to mine.
Alright, I bought a physical Amnesia CD. I finished the game and found out about Justine. So I've been looking at the patch avaliable here because it says it comes with Justine. When I downloaded the patch, I pressed the icon that came up on my desktop and it installed something else (which confused me). From there I had no idea of what to do. So I looked here http://www.frictionalgames.com/forum/thread-8929.html and found I was supposed to merge the files? I did that and relaunched the game, but nothing changed. So now I'm here asking what I should do and how do I know when it's worked?
So to sum up:
I have a physical CD copy of Amnesia. Want to play Justine. What do I do? How will I know when I've done it?
I also was told about the super_secret.rar file. I found it, but when I tried to open it, it didn't know what to open it with. How do I open it? I know about the passwords and those things, but a thing poped up asking what to open it with. Do I open it with internet or word or what?