I have been trying to buy left 4 dead 2 for my friend as he list his but it isn't available...

The game was delisted so it's no longer possible to purchase it digitally. You can try checking game stores to see if they have a code, but that may be difficult to find and it wouldn't be guaranteed to work.

Hello @ramonava939!

Left 4 Dead and Left 4 Dead 2 are both currently available on Xbox One.

Buy Left 4 Dead - Microsoft Store

Buy Left 4 Dead 2 - Microsoft Store

You can buy it on physical disc, or if it's available in your region you can buy it digitally from Xbox.

Left 4 Dead

Left 4 Dead 2

[quote user="Daft Badger"]

5 new games have been added to the list but I think the most popular will be Left for Dead

• Brain Challenge
• Flashback
• Left 4 Dead
• Portal 2
• Babel Rising

[/quote]

I only see 2 games there.

I understand what he's asking. But I don't think it's possible.

Left 4 Dead has some DLC, The Sacrifice, that is supposed to combine the 2 stories. It's available for the 1st game as well as the 2nd. The OP bought it for Left 4 Dead 2 and wants to know how to get it to work in the first Left 4 Dead. I don't believe the
DLC is meant to work with both versions of the game. It would have to be purchased separately for the 1st version.