A lot of people seem to hastily download every Minecraft pre-release or new stable release and replace the current stable version, typically without creating a backup. They then realize they have no way of playing on the Empire servers until the new version is released. Even if you only download the new version when it is officially released, you won't be able to play on EMC immediately because Bukkit has to spend some time updating its server software, which usually takes a few days. If you suffer from this condition, there are a few ways to try the pre-release whilst still being able to play on the Empire server when you want to. Both methods below apply to new releases as well. Firstly, here is the latest stable JAR file (the one EMC is running): http://www.mediafire.com/download.php?2068r7p5jgbkv5u Current version: 1.3.1 Method 1A - Hot Swap (simple) Keep the stable minecraft.jar file somewhere on your computer. The best place is usually the desktop, but you can store it in the .minecraft/bin/ folder as long as you rename the file to something like minecraft_stable.jar or minecraft_backup.jar. When you want to play on EMC, rename the pre-release JAR file to something like minecraft_pr.jar and copy in the stable version or rename it to minecraft.jar if you kept it in the bin folder. When you want to play the pre-release, simply do the opposite. Method 1B - Magic Launcher (simpler) The Hot Swap method can be simplified by downloading Magic Launcher. This client, which you will use to launch Minecraft rather than the regular client, allows you to create different configurations of JAR files, settings and mods. After installing and running Magic Launcher, click on Setup. Then click on New, enter a name for the configuration, such as "EMC", and click OK. After creating the configuration, slick on Select and browse to the JAR file you would use to connect to EMC (it does not need to be named "minecraft.jar"). Now, assuming you updated, the Default configuration will be the latest version of Minecraft and the EMC configuration will be the version of Minecraft currently used on the server. Method 2 - Spoutcraft (recommended) Spoutcraft is the official client mod for Bukkit. It comes packed with a number of mods and tweaks to enhance quality and performance, such as MCPatcher and Optifine. It also offers a wide range of options to fine-tune how your game looks and runs. More information is available at http://dev.bukkit.org/client-mods/spoutcraft/. For this method, you will use Spoutcraft to run the latest stable version of Minecraft and connect to EMC. When you want to play a pre-release, simply load it up in the regular Minecraft client. Before installing, replace your pre-release minecraft.jar file with the latest stable version as in Method 1. When Spoutcraft installs, it creates its own folder called .spoutcraft and copies most of the files from .minecraft, excluding things such as stats and screenshots which you can copy over manually if you desire. Now it is simply a matter of keeping any pre-release versions in the .minecraft/bin/ folder and the latest stable version in the .spoutcraft/bin/ folder and running the respective client depending on which version of the game you want to play. Of course you are able to use Spoutcraft for the pre-release and Minecraft for EMC, but I recommend Spoutcraft for online play because of the performance enhancements and chat features like copy/paste and recent commands (pressing up and down arrows in chat box). Downloads for the latest stable version: EXE: http://dev.bukkit.org/media/files/602/695/Spoutcraft.exe JAR: http://dev.bukkit.org/media/files/602/697/Spoutcraft.jar APP: http://dev.bukkit.org/media/files/602/714/Spoutcraft.app.zip How to find the Minecraft folder On Windows, open up Run (Windows key + R), type in "%appdata%" and hit OK. This will take you to the Roaming folder in AppData and your .minecraft folder will be at the top. On Mac OS, go to your user folder, Library, Application Support and the folder is called "minecraft" as opposed to ".minecraft". One or more of these folders might be hidden but unfortunately I don't know how to reveal them as I don't own a Mac.