Forza Horizon 3 will be delisted soon, which means that you’ll no longer be able to purchase the game or the DLC digitally, but those who own the game will still be able to play the game.
As announced by Forza Horizon’s official Twitter account back on August 11, 2020, the game is currently is “End of Life” mode and will be on sale until September 27, 2020. That being said, the game will no longer be available for purchase in the Microsoft Store after September 27, 2020.
The game is “Play Anywhere” title, which means that you can play it on PC and Xbox. It is also “Xbox One X Enhanced.”
If you’re interested in trying out the game for the last time, you can find it here.