I bought this game on Steam several months ago and it was just reacently that I noticed this issue. The stock vehicle update (vivace) isn't installing on my game. Every time I tried to install it manually, the file would be damaged and it will only spawn a blue D-Series pickup truck. For those who had the same problem as I do, will you be so kind to share some experiences with me please? Any help will be appreciated.
Steam should be updating your game automatically. There is no reason for it to stay on that version. You could try uninstalling and the installing the game again. Should force Steam to download the latest files.
Nice! I reinstalled the game on Steam and now the game is updating itself. I just can't belive that I didn't even thought of reinstalling it. Thank you so much guys! That was brilliant. (still glad that I chose to buy the copyrighted game on Steam than getting a fake copy on some shopping website for a much lower price) ^v^