Dont worry about it, your content manager must be the 2.0 as the last one... (i would install this afternoon after work). Put the new cars and overwrite the old ones. i think so.. let us know. best regards.thank you but my CM behaves differently, it would uninstall first as you said but I can see in the CMD window that new tracks&cars are installed straight away after that.
I have no way that I know to stop the process at Uninstall and clean up the Enabled folder with only the version of the mods I need