What I did was install RDE through the auto installer on openiv, because it's easier and, as far I know, doesn't mess up as far as RDE is concerned. I then installed both of the most recent versions of the EUP packs manually, as badass originally posted, in the order of L&O and then S&R. I then installed the gameconfig, and the game launched without any errors. Crashing is likely due to an outdated gameconfig, or a gameconfig that doesn't support the large amount of addon vehicles that RDE brings on.