since i bought the game , impossible for me to launch the game .
a message said :
GAME CRASH
An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience.

you will find the report from launch below

11:46:17 launcher Preparing to launch minecraft client for 1.12

11:46:18 launcher Checking installations.

11:46:18 launcher Minecraft client 1.12 is ready to start.

11:46:18 launcher Starting!

11:46:19 launcher Using default game log configuration client-1.12.xml (outputs XML)

11:46:22 bhz Setting user: papyfrance

11:46:25 bib Skipping bad option: lastServer:

11:46:25 bhz LWJGL Version: 2.9.4

11:46:26 cet Reloading ResourceManager: Default

11:46:27 chk Starting up SoundSystem...

11:46:27 chk Initializing LWJGL OpenAL

11:46:27 chk (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)

11:46:27 chk OpenAL initialized.

11:46:27 chk Sound engine started

11:46:35 cdn Created: 1024x512 textures-atlas

11:46:40 com.mojang.text2speech.NarratorWindows Narrator library for x64 successfully loaded

11:46:52 chb Starting integrated minecraft server version 1.12

11:46:52 chb Generating keypair

11:46:53 j Loaded 488 advancements

11:46:53 net.minecraft.server.MinecraftServer Preparing start region for level 0

11:46:54 net.minecraft.server.MinecraftServer Preparing spawn area: 0%

11:46:55 net.minecraft.server.MinecraftServer Preparing spawn area: 5%

11:46:56 net.minecraft.server.MinecraftServer Preparing spawn area: 10%

11:46:57 net.minecraft.server.MinecraftServer Preparing spawn area: 19%

11:46:58 net.minecraft.server.MinecraftServer Preparing spawn area: 27%

11:46:59 om Keeping entity minecraft:pig that already exists with UUID 15db6502-4bbf-4e56-9aca-43fd2c4b2ec4

11:46:59 net.minecraft.server.MinecraftServer Preparing spawn area: 38%

11:47:00 net.minecraft.server.MinecraftServer Preparing spawn area: 49%

11:47:01 net.minecraft.server.MinecraftServer Preparing spawn area: 60%

11:47:02 net.minecraft.server.MinecraftServer Preparing spawn area: 72%

11:47:03 net.minecraft.server.MinecraftServer Preparing spawn area: 86%

11:47:04 net.minecraft.server.MinecraftServer Preparing spawn area: 99%

11:47:05 chb Changing view distance to 12, from 10

11:47:08 pj papyfrance[local:E:f890fe93] logged in with entity id 1121 at (3.5, 69.0, 247.5)

11:47:08 net.minecraft.server.MinecraftServer papyfrance joined the game

11:47:10 net.minecraft.server.MinecraftServer Can't keep up! Did the system time change, or is the server overloaded? Running 2145ms behind, skipping 42 tick(s)