That is strange. Trust me, I didn't ship it with both versions of the mod
Hmmm. I just repeated it; deleted the Ingenuity folder, redownloaded the whole modpack (1.2.0), and achieved the same result.
The duplicate mods are:
appliedenergistics2-rv2-stable-1
appliedenergistics2-rv2-stable-6
Botania r1.6-189
Botania r1.6-192
carnivora-0.1.3
carnivora-0.1
CodeChickenCore-1.7.10-1.0.4.29-universal
CodeChickenCore-1.7.10-1.0.6.43-universal
extrautilities-1.2.4c
extrautilities-1.2.6
NotEnoughItems-1.7.10-1.0.3.74-universal
NotEnoughItems-1.7.10-1.0.4.107-universal
runicdungeons-1.1.3
runicdungeons-1.1.4
TConstruct-1.7.10-1.8.4
TConstruct-1.7.10-1.8.5
TiCTooltips-mc1.7.10-1.2.3
TiCTooltips-mc1.7.10-1.2.4
Waila-1.5.7_1.7.10
Waila-1.5.10_1.7.10
ForgeMultipart-1.7.10-1.1.2.331-universal
ForgeMultipart-1.7.10-1.1.2.331-universal.jar.disabled
ForgeMultipart-1.7.10-1.2.0.345-universal
Once you duplicate the older mods, the pack launches normally.