I am using the latest...I just bought it from Simmarket....And, I download updates about every day...
As I've said, if you JUST updated using the internal Live Update feature, it will update JUST the GSX code because, as explained in the GSX manual, where Live Updates are discussed, the Live Update won't update automatically vehicles, sound, textures, etc. Which is why, we have separate vehicle updates installers.
Either download one of the vehicles update installers, or the *current* full installer for GSX, which contains all the vehicles updates.