Minecraft – How to uninstall Modloader for Minecraft

When you download Minecraft for Mac, you download an application file which you then place in your Applications folder. But that's just a wrapper for the "real" Minecraft binary files (a set of JAR files), which gets downloaded into your Application Support folder.

So when you delete and redownload the Minecraft application, you haven't done anything about the actual binaries already downloaded and being used. If these are corrupted (as they appear to be in your situation), they won't be fixed by redownloading the Minecraft application.

While "Force update" should do something about these files, you can do something about it yourself by manually deleting the downloaded JAR files.

To do this, you'll need to navigate to the path described in the error. In Finder, go to the Go menu and select Go to Folder... Type in the following:

~/Library/Application Support/minecraft

and click the Go button. Finder will open a new folder with a few subfolders, including one labeled bin. Throw the bin folder in the Trash and empty it.

Now go back into your Applications folder and open Minecraft. Minecraft will then redownload its binaries and the problem should be resolved.

The Minecraft installer is a new feature. It was introduced to remove the hassle of manually setting up Minecraft, but it may have some quirks that make it stop working on certain machines.

Nevertheless, there is an alternative way to install Minecraft:

• Head over to the Minecraft download site and download the file Minecraft.exe
• Open the file browser and navigate to your personal directory
• Create a new directory called Minecraft and place the downloaded file Minecraft.exe in there
• Rightclick the Minecraft.exe and select create shortcut. That creates a shortcut that you can drag onto your desktop.
• Double click the shortcut to start Minecraft

I hope that works for you! If not, please leave a comment with further details.