while using the Dev Launcher, it re-downloads the *.jar file over again every time i go to play. Also there is no offline mode
every time I go to play it re-downloads the .jar file so I cant have mods even, without mods it still re-downloads it

And no it is not a copy of
https://mojang.atlassian.net/browse/MC-14569

I know how to fix this problem,
First go into %appdata%

Then go into .minecraft folder

Then versions.
C:\Users\ \AppData\Roaming\.minecraft\versions

Click on a version and look for "version name".json (I.e 13w16b.json)

if not there copy and paste
to a .json file within the version u want

Change\/ id \/ to whateva u want

{
"id": "whateva u want",
"time": "Mar 20, 2013 12:00:00 PM",
"releaseTime": "Mar 20, 2013 12:00:00 PM",
"type": "release",
"processArguments": "legacy",
"libraries": [

{ "name": "org.lwjgl.lwjgl:lwjgl:2.9.0" }

,

{ "name": "org.lwjgl.lwjgl:lwjgl_util:2.9.0" }

,

{ "name": "net.java.jinput:jinput:2.0.5" }

,

{ "name": "net.java.jutils:jutils:1.0.0" }

,
{
"name": "org.lwjgl.lwjgl:lwjgl-platform:2.9.0",
"natives":

{ "linux": "natives-linux", "windows": "natives-windows", "osx": "natives-osx" }

,
"extract":

{ "exclude": [ "META-INF/" ] }

},
{
"name": "net.java.jinput:jinput-platform:2.0.5",
"natives":

{ "linux": "natives-linux", "windows": "natives-windows", "osx": "natives-osx" }

,
"extract":

{ "exclude": [ "META-INF/" ] }

}
],
"mainClass": "net.minecraft.client.Minecraft"
}

I have solved that issue, but every time I go to play it re-downloads the .jar file so I cant have mods even, without mods it still re-downloads it