so, i used the installer to put forge on the gf's laptop...but its not working at all. when i try to run the forge profile the launcher runs for minecraft, i press play, the launcher closes and nothing happens past that. i have no clue whats happening as i have not had this problem before. she has windows 8.1 and im trying to run it on minecraft 1.6.4. the version im trying to install is 9.11.1.965

 

this is the forge log since the is at this point no crash log for minecraft itself.

 

 

 

 

 

2014-11-02 01:35:34 [iNFO] [ForgeModLoader] Forge Mod Loader version 6.4.49.965 for Minecraft 1.6.4 loading

2014-11-02 01:35:34 [iNFO] [ForgeModLoader] Java is Java HotSpot Client VM, version 1.8.0_25, running on Windows 8.1:x86:6.3, installed at C:\Program Files (x86)\Java\jre1.8.0_25

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Java classpath at launch is C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\net\minecraftforge\minecraftforge\9.11.1.965\minecraftforge-9.11.1.965.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.8\launchwrapper-1.8.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\Valerie\AppData\Roaming\.minecraft\versions\forge\forge.jar

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Java library path at launch is C:\Users\Valerie\AppData\Roaming\.minecraft\versions\forge\forge-natives-12442474460295

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Enabling runtime deobfuscation

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Instantiating coremod class FMLCorePlugin

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Enqueued coremod FMLCorePlugin

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Instantiating coremod class FMLForgePlugin

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Enqueued coremod FMLForgePlugin

2014-11-02 01:35:34 [FINE] [ForgeModLoader] All fundamental core mods are successfully located

2014-11-02 01:35:34 [FINE] [ForgeModLoader] Discovering coremods

2014-11-02 01:35:34 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

2014-11-02 01:35:34 [iNFO] [ForgeModLoader] Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

2014-11-02 01:35:34 [iNFO] [ForgeModLoader] Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

2014-11-02 01:35:34 [sEVERE] [ForgeModLoader] Unable to launch

java.util.ConcurrentModificationException

at java.util.ArrayList$Itr.checkForComodification(Unknown Source)

at java.util.ArrayList$Itr.remove(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)

at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

 

thank you for your consideration and hard work and hope to hear from someone soon.

 

Update minecraft and forge.

We really wanted to stick to 1.6.4 if we could. Is that the only way she can run forge?

I think you can use LexManos's JarFixer mod, but really you should be updating to Minecraft 1.7.10 and the latest Forge version. There is no more support for 1.6.4