crash of download of the version 18w48b

We do not have enough information to find the cause of this issue.

Please attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder] here.
If you cannot find a crash report, please attach the full launcher log found in [minecraft/launcher_log.txt|http://hopper.minecraft.net/help/guides/minecraft-logs/].

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21:17:30 launcher Preparing to launch minecraft client for 18w48b
21:17:30 launcher Checking installations.
21:17:30 launcher Minecraft client 18w48b is ready to start.
21:17:30 launcher Starting!
21:17:32 launcher Using default game log configuration client-1.12.xml (outputs XML)
21:17:34 cnv Setting user: Matte3688
21:17:40 cnx Skipping bad option: lastServer:
21:17:40 cnx Skipping bad option: maxFps:260
21:17:40 cnv LWJGL Version: 3.1.6 build 14
21:17:42 we Reloading ResourceManager: Default
21:17:59 doo Missing sound for event: minecraft:block.grindstone.use
21:17:59 doo Starting up SoundSystem...
21:17:59 doo Initializing No Sound
21:17:59 doo (Silent Mode)
21:17:59 doo OpenAL initialized.
21:17:59 doo Preloading sound minecraft:sounds/ambient/underwater/underwater_ambience.ogg
21:17:59 doo Sound engine started
21:18:08 dll Created: 1024x512 textures-atlas
21:18:10 com.mojang.text2speech.NarratorWindows Narrator library for x64 successfully loaded

Cannot see a crash in the logfile, please provide more information.

i have see to crash folder of minecraft but i never see the crash, but the first time that i have downloaded the game was crashed.

You provided the output log. Please attach the launcher log (.minecraft/launcher_log.txt) here.