I start the new non-Java launcher download and near the end of the down load it says "Unable to update the Minecraft Game Launcher". The nativelog file says:
########################################################
Native Launcher Version: 51
Operating System: Windows 8.1
Application Hash: b06079c75cb616544a6dbf83108db9a3265e1242
Java Version:
x64: 1
Starting download of: https://launchermeta.mojang.com/mc/launcher.json
Created pFile
Content length is 013727B8
Got 200 from server
Download successful
Runtime outdated!
Runtime version should be should be 1.8.0_25
Game launcher outdated!
Hash should be 270ccf341cf61d5bb5838515dba3c9283a899361
Starting download of: http://launcher.mojang.com/jre/win-64/1.8.0_25/bdca00e1c2a1f2c23c9a77b65188b788d475a603/jre-win-64-1.8.0_25.lzma
Created pFile
Content length is 01403C78
Got 200 from server
Encountered internet exception 12002: The operation timed out

Starting download of: http://launcher.mojang.com/jre/win-64/1.8.0_25/bdca00e1c2a1f2c23c9a77b65188b788d475a603/jre-win-64-1.8.0_25.lzma
Created pFile
Content length is 01403B88
Got 200 from server
Encountered internet exception 12002: The operation timed out

Starting download of: http://launcher.mojang.com/jre/win-64/1.8.0_25/bdca00e1c2a1f2c23c9a77b65188b788d475a603/jre-win-64-1.8.0_25.lzma
Encountered internet exception 12002: The operation timed out

Deleted game/_tmpJava.lzma
Starting download of: http://launcher.mojang.com/mc/launcher/jar/908282d51b77c48abc6972ab490e1e91b0e412d0/launcher.jar.lzma
Created pFile
Content length is 01403B28
Got 200 from server
Encountered internet exception 12002: The operation timed out

Starting download of: http://launcher.mojang.com/mc/launcher/jar/908282d51b77c48abc6972ab490e1e91b0e412d0/launcher.jar.lzma
Encountered internet exception 12002: The operation timed out

Starting download of: http://launcher.mojang.com/mc/launcher/jar/908282d51b77c48abc6972ab490e1e91b0e412d0/launcher.jar.lzma
Created pFile
Content length is 01403DC8
Got 200 from server
Encountered internet exception 12002: The operation timed out

Deleted game/launchertmp.jar.lzma