Launcher not starting Unstable 1.9

[SilvaDreams]

Title:

Launcher not starting Unstable 1.9​

Launcher Version:

1.4.12​

Modpack:

FTB Unstable 1.9​

Modpack Version:

Any​

Log Link:

​

Details of the issue:

Launcher will download files though it won't launch.
Clean installs of FTB launcher and mod pack result in the same error.

Checking local assets file, for MC version 1.9.4 Please wait!
Using backupLink for mcjsons/versions/1.9.4/1.9.4.json
GET request for mcjsons/versions/1.9.4/1.9.4.json failed. Please Send log to launcher team and provide your public IP address if possible.
Setting up native libraries for FTB Unstable 1.9 v Recommended Version MC 1.9.4
Syncing Assets:
Java Path: C:\Program Files\Java\jre1.8.0_91\bin\javaw.exe
Pack: FTB Unstable 1.9 1.9.4
Setting MinMemory to 256
Setting MaxMemory to 4096
Adding Optimization Arguments: -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+CICompilerCountPerCPU -XX:+TieredCompilation
Loading jars...
Added URL to classpath: file:/H:/FTB/FTBUnstable18/instMods/$%7Bforge_name%7D
Added URL to classpath: file:/H:/FTB/FTBUnstable18/minecraft/$%7Bminecraft_jar%7D
Loading natives...
Natives loaded...
Loading minecraft class
Jun 13, 2016 3:00:16 AM net.ftb.legacylaunch.Launch main
SEVERE: Unhandled error launching minecraft
java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.ftb.legacylaunch.Launch.main(Launch.java:85)​

 

[jikuja]

Why did not you post a full log? Post a full log (and update ypur launcher.

 

[SilvaDreams]

Why did not you post a full log? Post a full log (and update ypur launcher.

It was just standard startup logs before that, no issues there.
The mod pack updated and it is working fine now.
And 1.4.12 Build 10412 is the latest launcher (minus the curse launcher)