DetourCrowds is just an avoidance algo. What you do is make an AI Controller of a DetourCrowds class rather than the defalt kind and it will be enabled by default.
It works pretty well, but it’s not a silver bullet. Certainly better than RVO though since it seems to base its avoidance on direction of movement (i.e. enemies can’t force-field-push other enemies backward) and it also affects navigation movement in a useful way (i.e. enemies will rotate to a new movement direction rahee than just float-shoving sideways).