Minecraft will not run with any version. Please Help!

Solution 1:

Error 503 means that the server is not available at the moment. Mojang might be having a bit of trouble with their servers.

The most you can do right now is just try again later.

See here on wikipedia for more info.

Solution 2:

If you've got any sort of parental filter, that's probably what's blocking it.

The file it's trying to download is http://resources.download.minecraft.net/a2/a2dbb90f23b0babe7c569ceca28db49d0c112714
If you look closely at this random number, you'll see that it has a word in it that probably trips a parental filter.

http://resources.download.minecraft.net/a2/a2dbb90f23b0babe7c569ceca28db49d0c112714
The offending word is right........................... ^^^^ there.

A way around this is to download it with SSL (encryption): https://resources.download.minecraft.net/a2/a2dbb90f23b0babe7c569ceca28db49d0c112714
You'll most likely see this big scary warning about an SSL error that mentions *.cloudfront.net. Ignore this error and continue, then copy the file to

• Windows: %APPDATA%\.minecraft\assets\objects\a2\a2dbb90f23b0babe7c569ceca28db49d0c112714
• Mac: ~/Library/Application Support/minecraft/assets/objects/a2/a2dbb90f23b0babe7c569ceca28db49d0c112714
• Linux: ~/.minecraft/assets/objects/a2/a2dbb90f23b0babe7c569ceca28db49d0c112714

Launch Minecraft again and all will be well!