For Sony users, you will navigate the PlayStation main menu to NASCAR 21: Ignition and select the "Options" button on your controller. Scroll down to "Information" and select the X button. To check for updates, do the same process of selecting the "Options" button on the controller and scrolling down to "Check For Updates" and hitting the X button.
For Steam users, you will navigate to NASCAR 21: Ignition in your Steam Library, start the game and go to the "Options" menu on the main screen and select "General Options" and you will be able to see the version number on the bottom right.
For Xbox users, select the "Manage Game" button while on NASCAR 21: Ignition in the Games menu. From here, you can verify your Version and check for any additional updates.