Archipelagoat

Sorry if this has been asked, but I purchased the game server hosted by you guys and want to update the server side mods without clearing my world. is this possible? for example, I installed this mod and this mod aswell to my client, started the server, and the items aren't there. edit: If necessary, I'll "clear the world" and reupload a copy of the current world if possible in order to make them work.