So here at school, I only have my Mac and my friends XBOX360. I had Doom on XBLA but it was taken off the marketplace. Thing is, I bought it, and I can't find it to redownload it. How can I play it? Why was it taken down, and will they out it back up? Seems kind of wrong for them to take away from me something I paid for...

IT should be there.

Use the search function in the marketplace.