In the "General" tab, look for the "Java Edition Settings" section. Check the box that says "Show historical versions of Minecraft Java Edition in the Launcher."
Click on the Settings option in the bottom-left corner of the launcher window. Minecraft 1.2.6 Alpha Download LINK
For historical preservation purposes, community sites keep historical JAR files. In the "General" tab, look for the "Java
If you want to play older Minecraft versions safely and legally, use the official Minecraft launcher (it includes older versions once you own the game) or visit Mojang/Microsoft support pages for guidance on legacy versions. If you want to play older Minecraft versions
Name your installation (e.g., "Alpha 1.2.6"), select a dedicated directory folder if you want to keep your worlds separate from modern saves, and click Create . Hit Play to download the official files directly from Mojang's secure servers. Alternative Preservation Projects
Be extremely cautious: many websites offering download links for these specific modded files bundles malicious adware or executable viruses. Stick to the official launcher configurations or community-vetted open-source databases to keep your computer secure.
Go back to the Play tab, select your new 1.2.6 profile, and click . Note: This method ensures you have a clean, official file. 2. Archive Sites & Community Repositories