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I downloaded it but how to I get it downloaded to minecraft so I can play it? I have a mac and I'm just assuming that there's different instructions to do

I am a bit confused on how to download this for 1.8. I have a mac.

How do I download this mod?

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 11/30/15 3:51 PM
Description: Unexpected error

java.lang.NullPointerException
at mcreator_snowkey$snowkeyKeyBind.keyDown(mcreator_snowkey.java:159)
at cpw.mods.fml.client.registry.KeyBindingRegistry$KeyHandler.keyTick(KeyBindingRegistry.java:125)
at cpw.mods.fml.client.registry.KeyBindingRegistry$KeyHandler.tickStart(KeyBindingRegistry.java:102)
at cpw.mods.fml.common.SingleIntervalHandler.tickStart(SingleIntervalHandler.java:28)
at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:122)
at cpw.mods.fml.common.FMLCommonHandler.onPreClientTick(FMLCommonHandler.java:361)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1511)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Mac OS X (x86_64) version 10.11
Java Version: 1.8.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 140616608 bytes (134 MB) / 236756992 bytes (225 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.50.1,345 Minecraft Forge 9.11.1.1345 4 mods loaded, 4 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.4.50.1,345} [Forge Mod Loader] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.11.1.1345} [Minecraft Forge] (minecraftforge-9.11.1.1345.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_TheSpiritOFChristmasMod{Alpha 4.7} [mod_TheSpiritOFChristmasMod] (The Spirit Of Christmas Alpha 6.jar.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.6.4-Forge9.11.1.1345
LWJGL: 2.9.0
OpenGL: Intel HD Graphics 4000 OpenGL Engine GL version 2.1 INTEL-10.8.77, Intel Inc.
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null