The original Forza Horizon for Xbox 360 will be removed next month from the Xbox Games Store, according to a post on the Forza website.
As seen on a post written by community manager Brian Ekberg, the original Forza Horizon and all of its downloadable content will reach End of Life status on October 20. After that date, the game and its DLC will not be available for sale. However, players who got the game and/or any DLC online before the mentioned date will still be able to download software after the deadline.
Gamers who didn’t get the free download of the game earlier this month for not being Xbox Live Gold subscribers still got a chance to purchase the game for US$19.00.
[Source]: Forza: Forza Motorsport Week in Review 9-23-16: Forza Horizon EOL coming Oct. 20.