MCTimeMachine provides direct download links for the latest versions of Minecraft (client & server). All download links are direct links to the official sources on Mojang.com.

Latest Stable Release
Released on 22 Aug 2018
1.13.1
Latest Snapshot Release
Released on 16 Oct 2018
1.13.2-pre1
Latest Beta Release
Released on 18 Sep 2011
b1.8.1
Latest Alpha Release
Released on 02 Dec 2010
a1.2.6