If you need the files for modding or archival, use the official launcher to download the version once, then locate the .minecraft/versions/b1.9-preX/ folder and back it up. Minecraft Wiki – “Beta 1.9 Prereleases”
If you need the files for modding or archival, use the official launcher to download the version once, then locate the .minecraft/versions/b1.9-preX/ folder and back it up. Minecraft Wiki – “Beta 1.9 Prereleases”