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15:16:41 INFO]: Unpacking natives to C:\Users\Carson Chan\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-61564990403540
[15:16:41 INFO]: Launching in C:\Users\Carson Chan\AppData\Roaming\.minecraft
[15:16:41 INFO]: Half command: C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Dos.name=Windows 10 -Dos.version=10.0 -Djava.library.path=C:\Users\Carson Chan\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-61564990403540 -cp C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\mojang\netty\1.6\netty-1.6.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.3.5\realms-1.3.5.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\java3d\vecmath\1.3.1\vecmath-1.3.1.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\net\sf\trove4j\trove4j\3.0.3\trove4j-3.0.3.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.10.Final\netty-all-4.0.10.Final.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\15.0\guava-15.0.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.21\authlib-1.5.21.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.1\lwjgl-2.9.1.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.1\lwjgl_util-2.9.1.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\libraries\tv\twitch\twitch\5.16\twitch-5.16.jar;C:\Users\Carson Chan\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10.jar net.minecraft.client.main.Main
[15:16:41 INFO]: Looking for orphaned versions to clean up...
[15:16:41 INFO]: Looking for old natives & assets to clean up...
[15:16:43 ERROR]: Game ended with bad state (exit code -1073740791)
[15:16:43 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[15:16:43 INFO]: Deleting C:\Users\Carson Chan\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-61564990403540
[15:16:43 WARN]: Couldn't delete C:\Users\Carson Chan\AppData\Roaming\.minecraft\versions\1.7.10\1.7.10-natives-61564990403540 - scheduling for deletion upon exit

Minecraft automatically downloads a new copy of itself every time you press play, it's an anti-piracy feature.

Quote from DuhDerp»

Minecraft automatically downloads a new copy of itself every time you press play, it's an anti-piracy feature.

Don't be silly.

Game ended with bad state (exit code -1073740791)

There are dozens of posts in the last few days pointing at this information / solution: https://bugs.mojang.com/browse/MC-112780

Quote from DuhDerp»

Minecraft automatically downloads a new copy of itself every time you press play, it's an anti-piracy feature.

It only downloads updates, once you downloaded it once, you dont need to be online

Quote from urielsalis»

It only downloads updates, once you downloaded it once, you dont need to be online

DuhDerp is telling the truth. In order to install an nonforge mod in to the jar you have to delete a bit of text from .json file in order for mc luncher not to download it. But if your offline the luncher does not redownload.

Quote from wotblitz»

DuhDerp is telling the truth. In order to install an nonforge mod in to the jar you have to delete a bit of text from .json file in order for mc luncher not to download it. But if your offline the luncher does not redownload.

Thats because the launcher tries to download it from their servers as you just specify the name, you edit that to make the launcher not try to update it. The new launcher doesnt have that thing(and the forge installer takes care of it IIRC)

Quote from wotblitz»

DuhDerp is telling the truth. In order to install an nonforge mod in to the jar you have to delete a bit of text from .json file in order for mc luncher not to download it. But if your offline the luncher does not redownload.

If you CORRUPT your installation of say the official 1.10.1 version by modifying it, then yes, the launcher will download a NON-CORRUPT copy of that jar.
You are supposed to make a non-official version in the version list if you want to modify it.