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You update your minecraft or get the older version. If your minecraft version doesn't match the server's version, then you can't join it no matter what you do.
You type /toggledownfall but you need to have cheats on (for singleplayer) or be an OP on a server
A dedicated Minecraft server is a server where you can play original Minecraft. Usually without plugins or mods.
Minecraft 1.2.3 is a game version, not a server.
The Mineplex MineCraft Server is owned by Bluetomb.