Nascar 21: Ignition has been updated to version 1.43 today by Motorsport Games. You can find out the complete patch notes from here.
After the last update, it appears that there was some backlash among the players. This new patch appears to resolve some of the issues that were reported including certain DLC Paint Schemes that weren’t unlocking for the players. As it is the case, you can take a look at the complete patch notes below.