If you are in Single Player or with cheats enabled then you can spawn in the items from this mod using the following codes:

Spawn in the Tranq Metal Arrow Blueprint:
cheat giveitem "Blueprint'/Game/Mods/CompoundBowPlus/MetalArrowTranq/PrimalItemAmmo_CompoundBowArrowTranq.PrimalItemAmmo_CompoundBowArrowTranq'" 1 0 true

Spawn in the Drain Metal Arrow Blueprint:
cheat giveitem "Blueprint'/Game/Mods/CompoundBowPlus/MetalArrowDrain/PrimalItemAmmo_CompoundBowArrowDrain.PrimalItemAmmo_CompoundBowArrowDrain'" 1 0 true

Spawn in the Harpoon Metal Arrow Blueprint:
cheat giveitem "Blueprint'/Game/Mods/CompoundBowPlus/MetalArrowHarpoon/PrimalItemAmmo_CompoundBowArrowHarpoon.PrimalItemAmmo_CompoundBowArrowHarpoon'" 1 0 true

Spawn in x50 Tranq Metal Arrows:
cheat giveitem "Blueprint'/Game/Mods/CompoundBowPlus/MetalArrowTranq/PrimalItemAmmo_CompoundBowArrowTranq.PrimalItemAmmo_CompoundBowArrowTranq'" 50 0 false

Spawn in x50 Drain Metal Arrows:
cheat giveitem "Blueprint'/Game/Mods/CompoundBowPlus/MetalArrowDrain/PrimalItemAmmo_CompoundBowArrowDrain.PrimalItemAmmo_CompoundBowArrowDrain'" 50 0 false

Spawn in x5 Harpoon Metal Arrows:
cheat giveitem "Blueprint'/Game/Mods/CompoundBowPlus/MetalArrowHarpoon/PrimalItemAmmo_CompoundBowArrowHarpoon.PrimalItemAmmo_CompoundBowArrowHarpoon'" 5 0 false

Spawn in x1 Primitive Compound Bow: (this is the unmodified original Compound Bow)
admincheat giveitemnum 376 1 0 0