I think it's still free. When I tried to "buy" it using my computer to access my account, it showed the price of 800 points. But when I used my xbox to access it, it showed as free and that's how I did it. I looked just now and it still says "get haunt for free". I do have a gold membership, but I think it's probably free to anyone with an xbox acct? Have you tried getting it from the actual xbox "dashboard"?
On the "home" screen, you should see boxes (choices) for things like "open tray", "quick play", etc. Look at the upper right hand "box", it should say "free" at the top, has a picture of a haunted house and "kinect central" at the bottom. If you select that box, it takes you to the kinect central screen. On the first screen "spotlight", you should see some boxes here that include "most popular", "kinect sports", etc. The middle box should show the haunted house and "get haunt for free". Select that box and it should bring up the option to "buy" it. Hopefully it shows free.
I think that's how I did it and I hope that works for you. If you have already tried this and it didn't work, I apologize for the long, probably confusing post. I just remember that I had to do it through my xbox 360 to get it for free and not on my computer. Let me know if that works for you, or if you are still having trouble getting it for free. Good luck!
Don't make excuses...make Choices!
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