Rp chat is literally the worst addon ever invented. Please please don't host a server with rp chat because you'll actively reduce the master server quality by 36% every second you host it
The addon your looking for is Server_roleplay. I am obligated to provide this info because this is a suggestion thread. But I also suggest you rethink what you plan on using this for. I suggest you avoid downloading rp chat because realism is dumb and arbitrary restrictions on communication is the stupidest thing ever. It works in a tdm when teams need to communicate with each other, but rp chat is distance bound and there's many threads on why every server sucks because the map is too large and you'll be away from 90% of people
Please reconsider and call this Rp Chat Prevention Hotline at 1-800-666-1337. We're always here on this toll free number if you feel the urge to download rp chat, please talk to us before you make any dangerous decisions.