So, if you wanted to play on the server, and you can't join because of the map, here's how to do it.
DRIVE WHERE STEAM IS INSTALLED>ProgramFiles(x86)>Steam>SteamApps>common>GarrysMod>garrysmod>Maps> Delete any downtown_zarp map you may have installed in it. Then join the server, and it will automatically download the map for you, then you will be able to play on Server 1.

So, if you wanted to play on the server, and you can't join because of the map, here's how to do it. [b]DRIVE WHERE STEAM IS INSTALLED>ProgramFiles(x86)>Steam>SteamApps>common>GarrysMod>garrysmod>Maps> Delete any downtown_zarp map you may have installed in it[/b]. Then join the server, and it will automatically download the map for you, then you will be able to play on Server 1.