Unfortunately not, creators should ideally add to the description where to get non DLS stuff and not assume we all have all the DLC and third party non DLS stuff installed. Afraid with routes, if I don't know the creator and there's nothing on the forum about it, I don't bother downloading it.
Just to mention though sometimes you can find the missing items by right click, show asset versions and find there is an updated kuid2 version that Content manager hasn't pulled in.