Set run directory to C:\Program Files (x86)\Minecraft
Native Launcher Version: 1148
Operating System: Windows 7 Home Premium
Application Hash: 04f46f294e363ba0618ce6392e778e8c7a63a175
Application Data directory: C:\Users\Michał\AppData\Roaming/.minecraft
Executable Path: MinecraftLauncher.exe
App Directory dir: C:\Program Files (x86)\Minecraft
Start dir: C:/Users/Michał/AppData/Roaming/.minecraft
Launcher dir: C:/Program Files (x86)/Minecraft/game
TmpDir dir: C:/Program Files (x86)/Minecraft/tmp
(Optional) Java Launcher hash: d0603470df7a677540642656d065788d8d64bed2
Java Version: 1.8.0_25
x64: 1
LauncherConfiguration from: http://launchermeta.mojang.com/mc/launcher.json
Downloaded config
Native launcher is current
Native launcher is current
Loaded upgrade id: 300348732
Using old launcher as we're not in the rollout.
Launcher jar is up to date with hash d0603470df7a677540642656d065788d8d64bed2
Check to see if we can run the launcher
Native launcher is current
Started application ./runtime/jre-x64/1.8.0_25/bin/javaw.exe -cp "C:/Program Files (x86)/Minecraft/game/launcher.jar" net.minecraft.launcher.Main --nativeLauncherVersion 1148
Application still running, assuming all's fine.