this is for those who don't want to spend $27 for just a game and want to play full version for free
Step 1: Download Minecraft Magic Launcher
download minecraft magic launcher from this link
Step 2: Open It
double click on it and click on setup.
Don't click on play or else it won't work
Step 3: Setup Screen
when you click on setup this type of screen should appear
Step 4: Change Classic to 1.6.4
click on classic and choose 1.6.4 from there
Step 5: Click on Test
don't click on OK, click on test.