Hi Last year I bought the Nurburgrind Legends DLC at the STEAM store, mainly because the circuit and some cars, but for a few weeks I have realized that some liveries can't longer use them, It forces me to buy them. I noticed by the Pagani Zonda, but there are three other vehicles that also have the same problem, there's something wrong with my account? Thank you in advance
If you could use those liveries in the past, then indeed it is a problem and you should write to support. There's also a possibility, that they added some liveries at a later date.
I have the same thing. My bet would be the "missing" liveries were simply added later and were not a part of DLC bundle.