Hello,
If my Forge is done with loading, my Minecraft says: 
It looks like you are using an unsupported modified version of the game.
Here the Crash Report, hope you can help me! 
Also, if I just need to re-install my Minecraft, I am afraid my files lost! 
---- Minecraft Crash Report ----
// Uh... Did I do that?
Time: 7/18/17 11:41 AM
Description: Initializing game
java.lang.NoClassDefFoundError: net/minecraft/client/renderer/RenderItem
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:504)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:352)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	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:483)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.RenderItem
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 9 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transform(MixinTransformer.java:603)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer$Proxy.transform(MixinTransformer.java:183)
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
	... 11 more
Caused by: org.spongepowered.asm.mixin.throwables.MixinApplyError: Mixin [mixins.replay.replaymod.json:MixinRenderItem] from phase [DEFAULT] in config [mixins.replay.replaymod.json] FAILED during APPLY
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.handleMixinError(MixinTransformer.java:882)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.handleMixinApplyError(MixinTransformer.java:835)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transform(MixinTransformer.java:595)
	... 14 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InvalidInjectionException: @Redirect annotation on redirect$getEnchantmentTime$zzp000 could not find 'func_191966_a'
	at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.findMethods(InjectionInfo.java:367)
	at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.readAnnotation(InjectionInfo.java:152)
	at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.(InjectionInfo.java:139)
	at org.spongepowered.asm.mixin.injection.struct.RedirectInjectionInfo.(RedirectInjectionInfo.java:39)
	at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.parse(InjectionInfo.java:412)
	at org.spongepowered.asm.mixin.transformer.MixinTargetContext.prepareInjections(MixinTargetContext.java:1086)
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.prepareInjections(MixinApplicatorStandard.java:880)
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:293)
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:257)
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:327)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.apply(MixinTransformer.java:816)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.applyMixins(MixinTransformer.java:786)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transform(MixinTransformer.java:591)
	... 14 more
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:504)
-- Initialization --
Details:
Stacktrace:
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:352)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	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:483)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
-- System Details --
Details:
	Minecraft Version: 1.11.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 156186616 bytes (148 MB) / 338124800 bytes (322 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.38 Powered by Forge 13.20.0.2228 16 mods loaded, 16 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UCH	minecraft{1.11.2} [Minecraft] (minecraft.jar) 
	UCH	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) 
	UCH	FML{8.0.99.99} [Forge Mod Loader] (forge-1.11.2-13.20.0.2228.jar) 
	UCH	forge{13.20.0.2228} [Minecraft Forge] (forge-1.11.2-13.20.0.2228.jar) 
	UCH	mercurius_updater{1.0} [mercurius_updater] (MercuriusUpdater-1.11.jar) 
	UCH	replaymod-compat{1.12-2.0.0} [Replay Mod - Compatibility] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-render{1.12-2.0.0} [Replay Mod - Render] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-replay{1.12-2.0.0} [Replay Mod - Replay] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod{1.12-2.0.0} [Replay Mod] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-editor{1.12-2.0.0} [Replay Mod - Replay Editor] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-extras{1.12-2.0.0} [Replay Mod - Extras] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-online{1.12-2.0.0} [Replay Mod - Online] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-recording{1.12-2.0.0} [Replay Mod - Recording] (replaymod-1.12-2.0.0.jar) 
	UCH	replaymod-simplepathing{1.12-2.0.0} [Replay Mod - Simple Pathing] (replaymod-1.12-2.0.0.jar) 
	UCH	lunatriuscore{1.1.2.39} [LunatriusCore] (LunatriusCore-1.11-1.1.2.39-universal.jar) 
	UCH	schematica{1.7.8.161} [Schematica] (Schematica-1.11-1.7.8.161-universal.jar) 
	Loaded coremods (and transformers): 
LoadingPlugin (replaymod-1.12-2.0.0.jar)
  
	GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 376.53' Renderer: 'GeForce GTX 1060 3GB/PCIe/SSE2'
	Launched Version: 1.11.2-forge1.11.2-13.20.0.2228
	LWJGL: 2.9.4
	OpenGL: GeForce GTX 1060 3GB/PCIe/SSE2 GL version 4.5.0 NVIDIA 376.53, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.
	Using VBOs: Yes
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Resource Packs: iiPurpp
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz