Various help pages in regards to accessing older versions of Minecraft as well as common issues faced with playing the game (e.g. player skins not loading or graphical issues)

• MultiMC Launcher – An excellent 3rd party launcher, capable of supporting various mods and other settings with ease.
• Betacraft Launcher – A custom launcher designed for legacy Minecraft versions.
• Betacraft Proxy – Enables skin and session support for older versions.
  Proxy Port Reference

  • <c0.0.13a; c0.30> – -Dhttp.proxyHost=betacraft.uk -Dhttp.proxyPort=11701
  • <in-20091223-0040; a1.1.2_01> – -Dhttp.proxyHost=betacraft.uk -Dhttp.proxyPort=11702
  • <a1.0.8> – -Dhttp.proxyHost=betacraft.uk -Dhttp.proxyPort=11703
  • <a1.2.0-preview; b1.8.1> – -Dhttp.proxyHost=betacraft.uk -Dhttp.proxyPort=11705
  • <b1.9-pre1; b1.9-pre6> – -Dhttp.proxyHost=betacraft.uk -Dhttp.proxyPort=11706
  • <1.0.0-rc1; 1.5.2> – -Dhttp.proxyHost=betacraft.uk -Dhttp.proxyPort=11707
• OptiFine (Old Versions) – Performance and graphics enhancer with older builds available.
• MCArchive – A repository of old Minecraft jars and tools.
• Omniarchive – Another repository of old Minecraft jars and tools.
• Modification Station – A modding community and hub for mods r1.2.5 and lower.