Optimum Modpack

With the 2.1.2 Alpha update, this is the changelog
Also, something went wrong while trying to update The Undergarden mod. So couldn't update that one. But other than that, you should be able to update with no problems, make sure to backup though

Added Mods:

Applied Energistics 2
Common Capabilities
Cyclops Core
Gauges and Switches
Integrated Crafting
Integrated Dynamics
Integrated Terminals
Integrated Tunnels
Inventory Pets

Updated:

Archer's Paradox
Ars Nouveau
Cloth Config API (Forge)
CoFH Core
Culinary Construct
Curios API (Forge)
Cyclic
Ensorcellation
Environmental Core
Environmental Tech
Extreme sound muffler (Forge)
Extreme Reactors
GraveStone Mod
Just Enough Items (JEI)
Light Overlay (Rift/Forge/Fabric)
Polymorph (Forge)
Quark
Rats
Refined Storage
Thermal Cultivation
Thermal Expansion
Thermal Foundation
Thermal Innovation
Thermal Locomotion
ValkyrieLib
Woot
ZeroCore 2