This article covers how to add Car Pass cars to the player garage. Please see the following articles on how to get Hot Wheels and Rally Adventure DLC cars.
Make sure that you have downloaded and installed your DLC packs/cars from the Microsoft Store on either PC or Xbox.
When you are in the game, you can either travel to the Horizon Festival or to any House you own to access the Autoshow.
Navigate to the Store Tab in the menu
Open Car Packs
Select the DLC pack you want (Example is Formula Drift)
From here you can 'purchase' your cars for FREE. Once they are purchased they will appear in your garage.
Only the account that purchased the content will be able to buy the cars for free. Only the first of each car is free in this way. If you have done all the above steps and are still being asked to use in game Credits to purchase your DLC cars, please submit an DLC Issues Ticket.
You can also redeem your free cars from the Autoshow.
Open the Autoshow
Use Jump to Manufacturer to Formula Drift
From here you can 'purchase' your cars for FREE. Once they are purchased they will appear in your garage.
Troubleshooting
Please see the following articles for more information on troubleshooting.