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Because the game's engine was in its infancy in 2011, exploits in Beta 1.7.3 are incredibly potent compared to modern version counterparts. Movement Exploits Minecraft Beta 1.7.3 Hacked Client
The best tool to easily install old versions of Minecraft. What (like X-Ray or KillAura) are most important to you
Because these files are old and hosted on archival sites, scan all downloads with updated antivirus software. Never execute .exe files; legitimate legacy clients will only consist of .class or .jar files. Minecraft Beta 1.7.3 Hacked Client
Nodus was stable. It rarely crashed the Beta client, which was a miracle given how unstable Java 6 was.