This will not affect any compatibility with any amxx plugins or server configurations. Metamod is the process that launches amxx. Switching is very simple, use your server hosts wizard to set the Metamod dll to 1.21-am. Alternatively you can download from https://wiki.alliedmods.net/Amx_mod_..._release_notes You can check what version your server is using here on gametracker, then go to server variables. https://www.gametracker.com/server_i...ver_variables/ If a server is running Metamod-P 1.21p37, alert the server operator.