1- Click on Windows download link. The download should start.
2- Go to the bottom left on the screen, press the START button (Windows icon).
3- Type in the search bar: %appdata% and press enter.
4- Open the folder [.minecraft] then open the folder [bin].
5- Delete the file called [Minecraft] (Back it up if you want to keep your mods)
6- Open the ZIP file you downloaded in step 1
7- Drag the program [Minecraft] from the ZIP over into the folder [bin].
8- Go back to the folder [.minecraft] from step 4.
9- Now open the folder [saves].
10- Open the ZIP file you downloaded again, and drag the folder [TaleofaKnight] over into the [saves] folder.
11- Now run Minecraft like you always do. If all is done correctly, you will see the startup Mojang picture has been changed.
12- Be sure you follow the rules listed on the left. These are added to improve your game experience! Have fun!