WWE2K15 Sting ?

It should be under the downloaded superstars section of the roster.

Like said above check under downloaded superstars. But also make sure its downloaded correctly. I did a hard reset of my console then Sting appeared that way. Odd but it worked.

That happened to me aswell with wwe2k15

UPDATE: WWE is now selling Sting merchandise on WWEShop.com. Thus, his licensing of the character
extends beyond just WWE 2K15.

Sting will be doing a signing promoted by American Icon Autographs on July 27th in San Diego. Hulk
Hogan was booked for the 27th but his sold out quickly and they convinced him to change his travel plans for an additional signing on July 26th. With Sting signing on for the 27th, this will be the first time they are available for photo opportunities
together.

ORIGINAL: It was announced on Monday's WWE RAW that wrestling legend Sting will be a playable character in WWE 2K15.

The only way to get Sting as a playable character is by pre-ordering the game

There will be "2 Generations" of Sting in the game, both Surfer Sting and Crow Sting.

Also read: ​PHOTO & VIDEO - Sting Confirmed For WWE 2K15

A video package aired featuring an orchestra, all painted their faces painted like Sting. As they played, Sting came down from the rafters, baseball bat in hand. This was the video promo that WWE filmed last month when they posted an open casting call.

This will be Sting's first appearance in a WWE video game.

Hello have you check via microsoft account through purchases to see if its listed? If you see it it should give option to redownload to console of choice.