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Download Minecraft a1.2.3_01

Minecraft Java Edition version a1.2.3_01 was released to players on 2010-11-23.

Released

Client Jar
Download Client Jar
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Manual Downloads

You'll need the proper technical setup and configuration to run your own server. If you're not comfortable with this, we recommend using Nodecraft for a hassle-free experience.

If you understand and wish to proceed, you can download the jar files below.

Download Client Jar