Games remove from the Marketplace by game developers

On top of what Maxen13 said there are no real product keys available to end users with the way the 360 is designed. You also only licensed the game for use on the 360 so a product key for a PC version would technically be a separate purchase.

No, once a product is de-listed it cannot be purchased or downloaded.

If, however, you bought it previously, you should still be able to re-download it through your Purchase History.

On the console, this can be found by going to Settings/Account/Download History.

From the web, it is at
live.xbox.com/.../history

If a game is removed from the marketplace it's usually down to a licensing issue or maybe the developers no longer exist.

Hi snake74500,

Thank you for posting on the Xbox forums. I'd be happy answer that.

Games can be removed from the Marketplace or the Microsoft Store due to licensing conflicts between the developers and Microsoft or any other online store that sold this game at one time. If a developer's license to sell a game from a marketplace expires,
the game is removed if the developers don't renew the license. Therefore if a game is no longer supported by the developers, then no more licenses can be sold so the game is removed to prevent people from buying a game that is no longer supported.

You can read more about Product availability from
Microsoft's Terms of Sale, section 10.

Hi,

I believe official support agents said that they were working with the developer to put the game back on the marketplace. There was an issue which is why it was removed from the marketplace.

They said they would update that original thread when they had something else to add.