Why does minecraft stop downloading?

I have the MinecraftSMP cracked Launcher.jar. The launcher is- Minecraft Open Launcher 1.0.8 (By Sparamoule)
And whenever I go to play It gives up downloading:
Gave up trying to download https://s3.amazonaws.com/...101023.jar for job 'Version & Libraries'
Job 'Version & Libraries' finished with 23 failure(s)!
Is this because of 1.7.4 or what? This happened with my KeiNett launcher too. What's the deal?

Added (1). Well, here's the thing. I'm on a school macbook air. They let us take them home and everything. But you know there's always the iboss website blocker so are there any good websites? Or can I use one of your profiles? I don't know. Just please help me.

Braydon Clubb

Try asking about it on the official minecraft forums

Broken Record

You are probably running too old of a version of minecraft's launcher. You should check if there's an update for the launcher you have. Quote from Minecraft.net: "The Minecraft launcher was updated 01 July 2013. To get latest version of the game, make sure that you have downloaded the latest version of the launcher from the link above."

The laucher at this point in time is in version 1.3.7, and it looks as if yours is in 1.0.8
That is all I can really think of it to be.

Victor Fugazzotto