[MCL-273] Update fails on Windows 7

Minecraft was running fine, then tried to do the update today and it failed at 80%. Got message that says "Failed To Launch - Fatal error occurred".

Have tried completely deleting %appdata% folder and reinstalling, both with the .exe and the .jar, and same thing happens every time.

Linked issues

duplicates 1

MCL-1 Unable to update minecraft: Fatal error occured (4): null Resolved

Comments 5

migrated 2012-12-21T03:56:38Z

i was able to update fine, is your firewall blocking it? try temporarily disabling it and then updating.

kumasasa 2012-12-21T04:38:50Z

Cannot confirm. Win7/64, Java 7U9/64

kumasasa 2012-12-22T10:19:03Z

Can confirm a bit.

When deleting minecraft.jar and starting the game with

java -Xmx1024M -Xms512M -cp Minecraft.exe net.minecraft.LauncherFrame

I get

java.lang.ClassNotFoundException: net.minecraft.client.MinecraftApplet
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at net.minecraft.GameUpdater.createApplet(GameUpdater.java:373)
        at net.minecraft.Launcher$1.run(Launcher.java:79)

but when going to Options in the Launcher and pressing Force Update, the game will download and start.

migrated 2013-02-11T17:52:05Z

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

kumasasa 2013-02-25T22:51:29Z

No answer on query, assuming issue is gone.