According to FIFA 15 XBOX Coins Electronic Arts,

According to FIFA 15 XBOX Coins Electronic Arts, the FIFA 15 demo set a record. More than 5.5 million people downloaded the demo, which is the most ever for any EA Sports demo. The 5.5 million downloads includes all platforms: Xbox One, Xbox 360, PlayStation 3, PlayStation 4, and Windows PC. It stands to reason that the number will continue to climb now that the game is available and the demo is still available. People who are new to the franchise and want to check it out will download, as will those who simply want to check and make sure that the game will work on their machines.

In a statement, EA Sports executive David Rutter stated, “We believe we have built a game in FIFA 15 that delivers the most immersive and responsive gameplay experience ever in the FIFA franchise, and we can’t wait for the millions of fans to start their season and experience all of the innovations.”
FIFA 15 came out in North America 3 days ago on September 23rd, and is coming out today in Europe. Currently, you can buy FIFA 15 for all of the platforms discussed above. EA Sports is working on versions of the game which will be compatible with other systems, including 3DS, PlayStation Vita, and Wii. You can also download FIFA 15 Ultimate Team free for iOS, Android and Windows operating systems for your mobile device.