Minecraft Offline Files Installer

Normally you would have to login to Minecraft for the first time before you can play offline, but this mod allows you to play offline for free without having a Mojang account.

To use offline mode for free (For 1.5.2 Users)
Download and start the Minecraft 1.5.2 Launcher (Here: http://bit.ly/minecraft-152)
Put in a Username (It doesn't have to be registered with Mojang)
Leave the Password box blank
Click Login, then click Play Offline (If this mod isn't installed, it'll say Not Downloaded)

Note: You can only play offline for free with the old launcher (1.5.2 and below), This is because the launcher was updated with version 1.6.2. However, If you have bought Minecraft 1.6.2 and are recieving the 'Not Downloaded' error, this program will fix it.

Minecraft is a sandbox construction game, inspired by Infiniminer, Dwarf Fortress and Dungeon Keeper, created by Markus Persson, the founder of Mojang AB. The game involves players placing and breaking various types of blocks in a three-dimensional environment. The player takes on an avatar that can break and place blocks, forming fantastic structures, creations, and artwork, on multiplayer servers and singleplayer worlds across multiple game modes. Minecraft is available to all players for 19.95 (US$26.95, AGBP17.95). Singleplayer and multiplayer, when purchased, can be played in the user's web browser, or using the downloadable launcher. Minecraft Classic is available to play for free. Minecraft development started around May 10, 2009, and pre-orders for the full game started being accepted on June 13, 2009. Minecraft's official release date was November 18, 2011. On April 5, 2013, Minecraft for the computer reached 10 million sales.

Requirements:

Java SE 6 Update 51 or Java SE 7 Update 40 or newer, Minecraft 1.5.2 Launcher or Minecraft 1.6.2 Launcher or newer