I saw the following Youtube video:
https://www.youtube.com/watch?v=olHOQ7aw8lM

And I want to play this with my friends. I have a server. I have subscribed to the original map and this NAVMESH version, but what else do I need to do? When I try to launch the server with the map "rp_southside" it says that there is no map with that name in "garrysmod/maps" and indeed there is not, but how do I put it there? I thought I needed to subscribe to the maps, add them to the steam collection, and connect the collection to the server.

I also want the monsters that chase us.