Detailed installation instructions can be found at http://tropicraft.net/downloads/

If you are feeling lazy or don't have an internet connection, or have some other reason for not wanting to go there, here is what you do:

Make sure to install in the order in which the instructions are listed below; if you do not, the mod WILL NOT WORK.

For single player:

DELETE META-INF!

Download MinecraftForge Build 269: http://adf.ly/673885/http://files.minecraftforge.net/minecraftforge-universal-4.1.2.269.zip
Put these files into minecraft.jar

Download RenderPlayerAPI http://www.minecraftforum.net/topic/1261354-132api-render-player-api/ 
Put these files into minecraft.jar

Put tropicraft.zip, CoroAI for MC 1.3.2.zip, and Weather 1.22 for MC 1.3.2.zip into the .minecraft/mods folder


IF YOU WANT THE CLEAR WATER VERSION:

Insert auw.class into the minecraft.jar after following the above instructions



For multi player:

Each user on a Tropicraft SMP server must mod their client jar as specified by the instructions above.

The server owner must modify the minecraft_server.jar in the following manner:

Download MinecraftForge Build 269: http://adf.ly/673885/http://files.minecraftforge.net/minecraftforge-universal-4.1.2.269.zip
Put these files into minecraft_server.jar

Download RenderPlayerAPI http://www.minecraftforum.net/topic/1261354-132api-render-player-api/ 
Put these files into minecraft_server.jar

Extract all files from tropicraft.zip into minecraft_server.jar