Telkit Development Edition is a testing pack currently designed for Minecraft 1.12.2.It is available on the Technic Launcher. The current release of Telkit Development Edition is version 1.3.4, released on Friday, December 8, 2017.

At present, Telkit Development Edition is the same as e=mc². This will likely remain the case unless we decide to separate the Telkit and e=mc² product lines.

Custom Sphax Patches (In Menu Loading Order, Top to Bottom)
Sphax PureBDcraft Modded Textures for e=mc² - December 5, 2017 for e=mc² 1.3.3+
These patches are notorious for not working if e=mc² is allocated less than 10 GB of RAM.

Basic Prerequisites
Technic Launcher
Java Runtime Environment 8u162 x64 - Windows - macOS - Linux

If you wish to play around with the e=mc².zip file, here is the direct download link.

Vanilla Minecraft Packs Compatible with Telkit
VoxelBox Scientific HD (1.6.1+) - superseded by NosLabs Custom Blocks mod
Original NosLabs Resource Pack (1.6.1+) - superseded by NosLabs Custom Blocks mod