Latest version (as of now) crashes the launcher every time I boot.

show the crash report

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

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Time: 9/5/19 12:16 PM
Description: Initializing game

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/EntityRenderer
at net.minecraftforge.client.ForgeHooksClient.shouldUseVanillaReloadableListener(ForgeHooksClient.java:959)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SimpleReloadableResourceManager.java:131)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SimpleReloadableResourceManager.java:112)
at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:808)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:247)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.EntityRenderer
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)
... 14 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:521)
at org.spongepowered.asm.mixin.transformer.Proxy.transform(Proxy.java:72)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
... 16 more
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: kotlin.Pair
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:682)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:670)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:267)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:241)
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1144)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:267)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:353)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.apply(MixinTransformer.java:724)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.applyMixins(MixinTransformer.java:703)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:509)
... 19 more
Caused by: java.lang.ClassNotFoundException: kotlin.Pair
... 29 more

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

-- Head --
Thread: Client thread
Stacktrace:
at net.minecraftforge.client.ForgeHooksClient.shouldUseVanillaReloadableListener(ForgeHooksClient.java:959)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SimpleReloadableResourceManager.java:131)
at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SimpleReloadableResourceManager.java:112)
at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:808)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:247)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
at net.minecraft.client.main.Main.main(SourceFile:123)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 654404120 bytes (624 MB) / 872415232 bytes (832 MB) up to 2147483648 bytes (2048 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.5.2838 5 mods loaded, 5 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State | ID            | Version      | Source                        | Signature                                |
|:----- |:------------- |:------------ |:----------------------------- |:---------------------------------------- |
| L     | minecraft     | 1.12.2       | minecraft.jar                 | None                                     |
| L     | mcp           | 9.42         | minecraft.jar                 | None                                     |
| L     | FML           | 8.0.99.99    | forge-1.12.2-14.23.5.2838.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| L     | forge         | 14.23.5.2838 | forge-1.12.2-14.23.5.2838.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| L     | betterportals | 0.2.7        | betterportals-0.2.7.jar       | None                                     |

Loaded coremods (and transformers): 
GL info: ' Vendor: 'Intel' Version: '4.5.0 - Build 25.20.100.6472' Renderer: 'Intel(R) HD Graphics 520'
Launched Version: 1.12.2-forge1.12.2-14.23.5.2838
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 520 GL version 4.5.0 - Build 25.20.100.6472, Intel
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: vanilla, programer_art, file/OldLava.zip, file/UnobtrusiveBunch.zip, file/EasierToKnow.zip, file/PeachGoldenApple.zip, file/Chains.zip, file/Villager Chest.zip
Current Language: ~~ERROR~~ NullPointerException: null
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz

is my crash report

@tetrisbit Wrong mod and old version.