Minecraft Witchery Download?

Please someone help me, the only thing my son asked for this year for his birthday was the Minecraft mod witchery. I've looked literally all over the internet and I can't find out how to download it. His birthday is in a week. Please help me.
P.S. If it helps we have a mac and he has version 1.8.8 of Minecraft. Thank you for helping he will really appreciate it.

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