BetaFix lets you enjoy Minecraft Beta 1.7.3 with working authentication, skins and capes! BetaFix does not rely on a third party proxy, everything is fixed client-side.

The bigest drawback of methods that rely on third party proxies is that you as a user do not have control over the proxy. With BetaFix you can verify and build the mod yourself!

To build the mod from scratch, simply run:

BetaFix can easily be installed in MultiMC.

Assuming you have created a clean Minecraft Beta 1.7.3 instance and build the mod yourself or grabbed the ZIP-file from the latest release, follow these instructions:

1. On the right-hand-side, click on Edit Instance.
2. On the right-hand-side, click on Add to Minecraft.jar.
3. Navigate to the BetaFix.zip file and open it.
4. BetaFix is now installed as a JAR-mod, the Version tab should look like this:

The creation of this fix was made very easy thanks to the RetroMCP-Java tool and wiki.vg!