Purchased a 6-car Car Pack but can't access it

I went to the Marketplace and saw my purchased car, the Alfa Romeo. However, I am unable to select it to drive in. Why?

Having similar issue. I purchased the “Forza Horizon 2 2015 Audi TTS Coupé” and it’s no where to be found. Why buy these if we can’t use them right away! Not even sure it will ever show up - waste of money!